diff options
7 files changed, 1579 insertions, 0 deletions
diff --git a/tests/glbook/Chapter_10/MultiTexture/MultiTexture_orig.c b/tests/glbook/Chapter_10/MultiTexture/MultiTexture_orig.c new file mode 100644 index 00000000..5324ad92 --- /dev/null +++ b/tests/glbook/Chapter_10/MultiTexture/MultiTexture_orig.c @@ -0,0 +1,213 @@ +//
+// Book: OpenGL(R) ES 2.0 Programming Guide
+// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
+// ISBN-10: 0321502795
+// ISBN-13: 9780321502797
+// Publisher: Addison-Wesley Professional
+// URLs: http://safari.informit.com/9780321563835
+// http://www.opengles-book.com
+//
+
+// MultiTexture.c
+//
+// This is an example that draws a quad with a basemap and
+// lightmap to demonstrate multitexturing.
+//
+#include <stdlib.h>
+#include "esUtil.h"
+
+typedef struct
+{
+ // Handle to a program object
+ GLuint programObject;
+
+ // Attribute locations
+ GLint positionLoc;
+ GLint texCoordLoc;
+
+ // Sampler locations
+ GLint baseMapLoc;
+ GLint lightMapLoc;
+
+ // Texture handle
+ GLuint baseMapTexId;
+ GLuint lightMapTexId;
+
+} UserData;
+
+
+///
+// Load texture from disk
+//
+GLuint LoadTexture ( char *fileName )
+{
+ int width,
+ height;
+ char *buffer = esLoadTGA ( fileName, &width, &height );
+ GLuint texId;
+
+ if ( buffer == NULL )
+ {
+ esLogMessage ( "Error loading (%s) image.\n", fileName );
+ return 0;
+ }
+
+ glGenTextures ( 1, &texId );
+ glBindTexture ( GL_TEXTURE_2D, texId );
+
+ glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
+
+ free ( buffer );
+
+ return texId;
+}
+
+
+
+///
+// Initialize the shader and program object
+//
+int Init ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+ GLbyte vShaderStr[] =
+ "attribute vec4 a_position; \n"
+ "attribute vec2 a_texCoord; \n"
+ "varying vec2 v_texCoord; \n"
+ "void main() \n"
+ "{ \n"
+ " gl_Position = a_position; \n"
+ " v_texCoord = a_texCoord; \n"
+ "} \n";
+
+ GLbyte fShaderStr[] =
+ "precision mediump float; \n"
+ "varying vec2 v_texCoord; \n"
+ "uniform sampler2D s_baseMap; \n"
+ "uniform sampler2D s_lightMap; \n"
+ "void main() \n"
+ "{ \n"
+ " vec4 baseColor; \n"
+ " vec4 lightColor; \n"
+ " \n"
+ " baseColor = texture2D( s_baseMap, v_texCoord ); \n"
+ " lightColor = texture2D( s_lightMap, v_texCoord ); \n"
+ " gl_FragColor = baseColor * (lightColor + 0.25); \n"
+ "} \n";
+
+ // Load the shaders and get a linked program object
+ userData->programObject = esLoadProgram ( vShaderStr, fShaderStr );
+
+ // Get the attribute locations
+ userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" );
+ userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" );
+
+ // Get the sampler location
+ userData->baseMapLoc = glGetUniformLocation ( userData->programObject, "s_baseMap" );
+ userData->lightMapLoc = glGetUniformLocation ( userData->programObject, "s_lightMap" );
+
+ // Load the textures
+ userData->baseMapTexId = LoadTexture ( "basemap.tga" );
+ userData->lightMapTexId = LoadTexture ( "lightmap.tga" );
+
+ if ( userData->baseMapTexId == 0 || userData->lightMapTexId == 0 )
+ return FALSE;
+
+ glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
+ return TRUE;
+}
+
+///
+// Draw a triangle using the shader pair created in Init()
+//
+void Draw ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+ GLfloat vVertices[] = { -0.5f, 0.5f, 0.0f, // Position 0
+ 0.0f, 0.0f, // TexCoord 0
+ -0.5f, -0.5f, 0.0f, // Position 1
+ 0.0f, 1.0f, // TexCoord 1
+ 0.5f, -0.5f, 0.0f, // Position 2
+ 1.0f, 1.0f, // TexCoord 2
+ 0.5f, 0.5f, 0.0f, // Position 3
+ 1.0f, 0.0f // TexCoord 3
+ };
+ GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
+
+ // Set the viewport
+ glViewport ( 0, 0, esContext->width, esContext->height );
+
+ // Clear the color buffer
+ glClear ( GL_COLOR_BUFFER_BIT );
+
+ // Use the program object
+ glUseProgram ( userData->programObject );
+
+ // Load the vertex position
+ glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT,
+ GL_FALSE, 5 * sizeof(GLfloat), vVertices );
+ // Load the texture coordinate
+ glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT,
+ GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] );
+
+ glEnableVertexAttribArray ( userData->positionLoc );
+ glEnableVertexAttribArray ( userData->texCoordLoc );
+
+ // Bind the base map
+ glActiveTexture ( GL_TEXTURE0 );
+ glBindTexture ( GL_TEXTURE_2D, userData->baseMapTexId );
+
+ // Set the base map sampler to texture unit to 0
+ glUniform1i ( userData->baseMapLoc, 0 );
+
+ // Bind the light map
+ glActiveTexture ( GL_TEXTURE1 );
+ glBindTexture ( GL_TEXTURE_2D, userData->lightMapTexId );
+
+ // Set the light map sampler to texture unit 1
+ glUniform1i ( userData->lightMapLoc, 1 );
+
+ glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices );
+
+ eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
+}
+
+///
+// Cleanup
+//
+void ShutDown ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+
+ // Delete texture object
+ glDeleteTextures ( 1, &userData->baseMapTexId );
+ glDeleteTextures ( 1, &userData->lightMapTexId );
+
+ // Delete program object
+ glDeleteProgram ( userData->programObject );
+}
+
+
+int main ( int argc, char *argv[] )
+{
+ ESContext esContext;
+ UserData userData;
+
+ esInitContext ( &esContext );
+ esContext.userData = &userData;
+
+ esCreateWindow ( &esContext, "MultiTexture", 320, 240, ES_WINDOW_RGB );
+
+ if ( !Init ( &esContext ) )
+ return 0;
+
+ esRegisterDrawFunc ( &esContext, Draw );
+
+ esMainLoop ( &esContext );
+
+ ShutDown ( &esContext );
+}
diff --git a/tests/glbook/Chapter_13/ParticleSystem/ParticleSystem_orig.c b/tests/glbook/Chapter_13/ParticleSystem/ParticleSystem_orig.c new file mode 100644 index 00000000..378d05a7 --- /dev/null +++ b/tests/glbook/Chapter_13/ParticleSystem/ParticleSystem_orig.c @@ -0,0 +1,294 @@ +//
+// Book: OpenGL(R) ES 2.0 Programming Guide
+// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
+// ISBN-10: 0321502795
+// ISBN-13: 9780321502797
+// Publisher: Addison-Wesley Professional
+// URLs: http://safari.informit.com/9780321563835
+// http://www.opengles-book.com
+//
+
+// ParticleSystem.c
+//
+// This is an example that demonstrates rendering a particle system
+// using a vertex shader and point sprites.
+//
+#include <stdlib.h>
+#include <math.h>
+#include "esUtil.h"
+
+#define NUM_PARTICLES 1000
+#define PARTICLE_SIZE 7
+
+typedef struct
+{
+ // Handle to a program object
+ GLuint programObject;
+
+ // Attribute locations
+ GLint lifetimeLoc;
+ GLint startPositionLoc;
+ GLint endPositionLoc;
+
+ // Uniform location
+ GLint timeLoc;
+ GLint colorLoc;
+ GLint centerPositionLoc;
+ GLint samplerLoc;
+
+ // Texture handle
+ GLuint textureId;
+
+ // Particle vertex data
+ float particleData[ NUM_PARTICLES * PARTICLE_SIZE ];
+
+ // Current time
+ float time;
+
+} UserData;
+
+///
+// Load texture from disk
+//
+GLuint LoadTexture ( char *fileName )
+{
+ int width,
+ height;
+ char *buffer = esLoadTGA ( fileName, &width, &height );
+ GLuint texId;
+
+ if ( buffer == NULL )
+ {
+ esLogMessage ( "Error loading (%s) image.\n", fileName );
+ return 0;
+ }
+
+ glGenTextures ( 1, &texId );
+ glBindTexture ( GL_TEXTURE_2D, texId );
+
+ glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buffer );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
+ glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
+
+ free ( buffer );
+
+ return texId;
+}
+
+
+///
+// Initialize the shader and program object
+//
+int Init ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+ int i;
+
+ GLbyte vShaderStr[] =
+ "uniform float u_time; \n"
+ "uniform vec3 u_centerPosition; \n"
+ "attribute float a_lifetime; \n"
+ "attribute vec3 a_startPosition; \n"
+ "attribute vec3 a_endPosition; \n"
+ "varying float v_lifetime; \n"
+ "void main() \n"
+ "{ \n"
+ " if ( u_time <= a_lifetime ) \n"
+ " { \n"
+ " gl_Position.xyz = a_startPosition + \n"
+ " (u_time * a_endPosition); \n"
+ " gl_Position.xyz += u_centerPosition; \n"
+ " gl_Position.w = 1.0; \n"
+ " } \n"
+ " else \n"
+ " gl_Position = vec4( -1000, -1000, 0, 0 ); \n"
+ " v_lifetime = 1.0 - ( u_time / a_lifetime ); \n"
+ " v_lifetime = clamp ( v_lifetime, 0.0, 1.0 ); \n"
+ " gl_PointSize = ( v_lifetime * v_lifetime ) * 40.0; \n"
+ "}";
+
+ GLbyte fShaderStr[] =
+ "precision mediump float; \n"
+ "uniform vec4 u_color; \n"
+ "varying float v_lifetime; \n"
+ "uniform sampler2D s_texture; \n"
+ "void main() \n"
+ "{ \n"
+ " vec4 texColor; \n"
+ " texColor = texture2D( s_texture, gl_PointCoord ); \n"
+ " gl_FragColor = vec4( u_color ) * texColor; \n"
+ " gl_FragColor.a *= v_lifetime; \n"
+ "} \n";
+
+ // Load the shaders and get a linked program object
+ userData->programObject = esLoadProgram ( vShaderStr, fShaderStr );
+
+ // Get the attribute locations
+ userData->lifetimeLoc = glGetAttribLocation ( userData->programObject, "a_lifetime" );
+ userData->startPositionLoc = glGetAttribLocation ( userData->programObject, "a_startPosition" );
+ userData->endPositionLoc = glGetAttribLocation ( userData->programObject, "a_endPosition" );
+
+ // Get the uniform locations
+ userData->timeLoc = glGetUniformLocation ( userData->programObject, "u_time" );
+ userData->centerPositionLoc = glGetUniformLocation ( userData->programObject, "u_centerPosition" );
+ userData->colorLoc = glGetUniformLocation ( userData->programObject, "u_color" );
+ userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" );
+
+ glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
+
+ // Fill in particle data array
+ srand ( 0 );
+ for ( i = 0; i < NUM_PARTICLES; i++ )
+ {
+ float *particleData = &userData->particleData[i * PARTICLE_SIZE];
+
+ // Lifetime of particle
+ (*particleData++) = ( (float)(rand() % 10000) / 10000.0f );
+
+ // End position of particle
+ (*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
+ (*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
+ (*particleData++) = ( (float)(rand() % 10000) / 5000.0f ) - 1.0f;
+
+ // Start position of particle
+ (*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
+ (*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
+ (*particleData++) = ( (float)(rand() % 10000) / 40000.0f ) - 0.125f;
+
+ }
+
+ // Initialize time to cause reset on first update
+ userData->time = 1.0f;
+
+ userData->textureId = LoadTexture ( "smoke.tga" );
+ if ( userData->textureId <= 0 )
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+///
+// Update time-based variables
+//
+void Update ( ESContext *esContext, float deltaTime )
+{
+ UserData *userData = esContext->userData;
+
+ userData->time += deltaTime;
+
+ if ( userData->time >= 1.0f )
+ {
+ float centerPos[3];
+ float color[4];
+
+ userData->time = 0.0f;
+
+ // Pick a new start location and color
+ centerPos[0] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
+ centerPos[1] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
+ centerPos[2] = ( (float)(rand() % 10000) / 10000.0f ) - 0.5f;
+
+ glUniform3fv ( userData->centerPositionLoc, 1, ¢erPos[0] );
+
+ // Random color
+ color[0] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
+ color[1] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
+ color[2] = ( (float)(rand() % 10000) / 20000.0f ) + 0.5f;
+ color[3] = 0.5;
+
+ glUniform4fv ( userData->colorLoc, 1, &color[0] );
+ }
+
+ // Load uniform time variable
+ glUniform1f ( userData->timeLoc, userData->time );
+}
+
+///
+// Draw a triangle using the shader pair created in Init()
+//
+void Draw ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+
+ // Set the viewport
+ glViewport ( 0, 0, esContext->width, esContext->height );
+
+ // Clear the color buffer
+ glClear ( GL_COLOR_BUFFER_BIT );
+
+ // Use the program object
+ glUseProgram ( userData->programObject );
+
+ // Load the vertex attributes
+ glVertexAttribPointer ( userData->lifetimeLoc, 1, GL_FLOAT,
+ GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
+ userData->particleData );
+
+ glVertexAttribPointer ( userData->endPositionLoc, 3, GL_FLOAT,
+ GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
+ &userData->particleData[1] );
+
+ glVertexAttribPointer ( userData->startPositionLoc, 3, GL_FLOAT,
+ GL_FALSE, PARTICLE_SIZE * sizeof(GLfloat),
+ &userData->particleData[4] );
+
+
+ glEnableVertexAttribArray ( userData->lifetimeLoc );
+ glEnableVertexAttribArray ( userData->endPositionLoc );
+ glEnableVertexAttribArray ( userData->startPositionLoc );
+ // Blend particles
+ glEnable ( GL_BLEND );
+ glBlendFunc ( GL_SRC_ALPHA, GL_ONE );
+
+ // Bind the texture
+ glActiveTexture ( GL_TEXTURE0 );
+ glBindTexture ( GL_TEXTURE_2D, userData->textureId );
+ glEnable ( GL_TEXTURE_2D );
+
+ // Set the sampler texture unit to 0
+ glUniform1i ( userData->samplerLoc, 0 );
+
+ glDrawArrays( GL_POINTS, 0, NUM_PARTICLES );
+
+ eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
+}
+
+///
+// Cleanup
+//
+void ShutDown ( ESContext *esContext )
+{
+ UserData *userData = esContext->userData;
+
+ // Delete texture object
+ glDeleteTextures ( 1, &userData->textureId );
+
+ // Delete program object
+ glDeleteProgram ( userData->programObject );
+}
+
+
+int main ( int argc, char *argv[] )
+{
+ ESContext esContext;
+ UserData userData;
+
+ esInitContext ( &esContext );
+ esContext.userData = &userData;
+
+ esCreateWindow ( &esContext, "ParticleSystem", 640, 480, ES_WINDOW_RGB );
+
+ if ( !Init ( &esContext ) )
+ return 0;
+
+ esRegisterDrawFunc ( &esContext, Draw );
+ esRegisterUpdateFunc ( &esContext, Update );
+
+ esMainLoop ( &esContext );
+
+ ShutDown ( &esContext );
+}
diff --git a/tests/glbook/Chapter_2/Hello_Triangle/Hello_Triangle_orig.c b/tests/glbook/Chapter_2/Hello_Triangle/Hello_Triangle_orig.c new file mode 100644 index 00000000..fd4c506a --- /dev/null +++ b/tests/glbook/Chapter_2/Hello_Triangle/Hello_Triangle_orig.c @@ -0,0 +1,193 @@ +// +// Book: OpenGL(R) ES 2.0 Programming Guide +// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner +// ISBN-10: 0321502795 +// ISBN-13: 9780321502797 +// Publisher: Addison-Wesley Professional +// URLs: http://safari.informit.com/9780321563835 +// http://www.opengles-book.com +// + +// Hello_Triangle.c +// +// This is a simple example that draws a single triangle with +// a minimal vertex/fragment shader. The purpose of this +// example is to demonstrate the basic concepts of +// OpenGL ES 2.0 rendering. +#include <stdlib.h> +#include "esUtil.h" + +typedef struct +{ + // Handle to a program object + GLuint programObject; + +} UserData; + +/// +// Create a shader object, load the shader source, and +// compile the shader. +// +GLuint LoadShader ( GLenum type, const char *shaderSrc ) +{ + GLuint shader; + GLint compiled; + + // Create the shader object + shader = glCreateShader ( type ); + + if ( shader == 0 ) + return 0; + + // Load the shader source + glShaderSource ( shader, 1, &shaderSrc, NULL ); + + // Compile the shader + glCompileShader ( shader ); + + // Check the compile status + glGetShaderiv ( shader, GL_COMPILE_STATUS, &compiled ); + + if ( !compiled ) + { + GLint infoLen = 0; + + glGetShaderiv ( shader, GL_INFO_LOG_LENGTH, &infoLen ); + + if ( infoLen > 1 ) + { + char* infoLog = malloc (sizeof(char) * infoLen ); + + glGetShaderInfoLog ( shader, infoLen, NULL, infoLog ); + esLogMessage ( "Error compiling shader:\n%s\n", infoLog ); + + free ( infoLog ); + } + + glDeleteShader ( shader ); + return 0; + } + + return shader; + +} + +/// +// Initialize the shader and program object +// +int Init ( ESContext *esContext ) +{ + esContext->userData = malloc(sizeof(UserData)); + + UserData *userData = esContext->userData; + GLbyte vShaderStr[] = + "attribute vec4 vPosition; \n" + "void main() \n" + "{ \n" + " gl_Position = vPosition; \n" + "} \n"; + + GLbyte fShaderStr[] = + "precision mediump float;\n"\ + "void main() \n" + "{ \n" + " gl_FragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );\n" + "} \n"; + + GLuint vertexShader; + GLuint fragmentShader; + GLuint programObject; + GLint linked; + + // Load the vertex/fragment shaders + vertexShader = LoadShader ( GL_VERTEX_SHADER, vShaderStr ); + fragmentShader = LoadShader ( GL_FRAGMENT_SHADER, fShaderStr ); + + // Create the program object + programObject = glCreateProgram ( ); + + if ( programObject == 0 ) + return 0; + + glAttachShader ( programObject, vertexShader ); + glAttachShader ( programObject, fragmentShader ); + + // Bind vPosition to attribute 0 + glBindAttribLocation ( programObject, 0, "vPosition" ); + + // Link the program + glLinkProgram ( programObject ); + + // Check the link status + glGetProgramiv ( programObject, GL_LINK_STATUS, &linked ); + + if ( !linked ) + { + GLint infoLen = 0; + + glGetProgramiv ( programObject, GL_INFO_LOG_LENGTH, &infoLen ); + + if ( infoLen > 1 ) + { + char* infoLog = malloc (sizeof(char) * infoLen ); + + glGetProgramInfoLog ( programObject, infoLen, NULL, infoLog ); + esLogMessage ( "Error linking program:\n%s\n", infoLog ); + + free ( infoLog ); + } + + glDeleteProgram ( programObject ); + return GL_FALSE; + } + + // Store the program object + userData->programObject = programObject; + + glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); + return GL_TRUE; +} + +/// +// Draw a triangle using the shader pair created in Init() +// +void Draw ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + GLfloat vVertices[] = { 0.0f, 0.5f, 0.0f, + -0.5f, -0.5f, 0.0f, + 0.5f, -0.5f, 0.0f }; + + // Set the viewport + glViewport ( 0, 0, esContext->width, esContext->height ); + + // Clear the color buffer + glClear ( GL_COLOR_BUFFER_BIT ); + + // Use the program object + glUseProgram ( userData->programObject ); + + // Load the vertex data + glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, vVertices ); + glEnableVertexAttribArray ( 0 ); + + glDrawArrays ( GL_TRIANGLES, 0, 3 ); +} + +int main ( int argc, char *argv[] ) +{ + ESContext esContext; + UserData userData; + + esInitContext ( &esContext ); + esContext.userData = &userData; + + esCreateWindow ( &esContext, "Hello Triangle", 320, 240, ES_WINDOW_RGB ); + + if ( !Init ( &esContext ) ) + return 0; + + esRegisterDrawFunc ( &esContext, Draw ); + + esMainLoop ( &esContext ); +} diff --git a/tests/glbook/Chapter_8/Simple_VertexShader/Simple_VertexShader_orig.c b/tests/glbook/Chapter_8/Simple_VertexShader/Simple_VertexShader_orig.c new file mode 100644 index 00000000..6036bf0c --- /dev/null +++ b/tests/glbook/Chapter_8/Simple_VertexShader/Simple_VertexShader_orig.c @@ -0,0 +1,196 @@ +// +// Book: OpenGL(R) ES 2.0 Programming Guide +// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner +// ISBN-10: 0321502795 +// ISBN-13: 9780321502797 +// Publisher: Addison-Wesley Professional +// URLs: http://safari.informit.com/9780321563835 +// http://www.opengles-book.com +// + +// Simple_VertexShader.c +// +// This is a simple example that draws a rotating cube in perspective +// using a vertex shader to transform the object +// +#include <stdlib.h> +#include "esUtil.h" + +typedef struct +{ + // Handle to a program object + GLuint programObject; + + // Attribute locations + GLint positionLoc; + + // Uniform locations + GLint mvpLoc; + + // Vertex daata + GLfloat *vertices; + GLuint *indices; + int numIndices; + + // Rotation angle + GLfloat angle; + + // MVP matrix + ESMatrix mvpMatrix; +} UserData; + +/// +// Initialize the shader and program object +// +int Init ( ESContext *esContext ) +{ + esContext->userData = malloc(sizeof(UserData)); + + UserData *userData = esContext->userData; + GLbyte vShaderStr[] = + "uniform mat4 u_mvpMatrix; \n" + "attribute vec4 a_position; \n" + "void main() \n" + "{ \n" + " gl_Position = u_mvpMatrix * a_position; \n" + "} \n"; + + GLbyte fShaderStr[] = + "precision mediump float; \n" + "void main() \n" + "{ \n" + " gl_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 ); \n" + "} \n"; + + // Load the shaders and get a linked program object + userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); + + // Get the attribute locations + userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); + + // Get the uniform locations + userData->mvpLoc = glGetUniformLocation( userData->programObject, "u_mvpMatrix" ); + + // Generate the vertex data + userData->numIndices = esGenCube( 1.0, &userData->vertices, + NULL, NULL, &userData->indices ); + + // Starting rotation angle for the cube + userData->angle = 45.0f; + + glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); + return GL_TRUE; +} + + +/// +// Update MVP matrix based on time +// +void Update ( ESContext *esContext, float deltaTime ) +{ + UserData *userData = (UserData*) esContext->userData; + ESMatrix perspective; + ESMatrix modelview; + float aspect; + + // Compute a rotation angle based on time to rotate the cube + userData->angle += ( deltaTime * 40.0f ); + if( userData->angle >= 360.0f ) + userData->angle -= 360.0f; + + // Compute the window aspect ratio + aspect = (GLfloat) esContext->width / (GLfloat) esContext->height; + + // Generate a perspective matrix with a 60 degree FOV + esMatrixLoadIdentity( &perspective ); + esPerspective( &perspective, 60.0f, aspect, 1.0f, 20.0f ); + + // Generate a model view matrix to rotate/translate the cube + esMatrixLoadIdentity( &modelview ); + + // Translate away from the viewer + esTranslate( &modelview, 0.0, 0.0, -2.0 ); + + // Rotate the cube + esRotate( &modelview, userData->angle, 1.0, 0.0, 1.0 ); + + // Compute the final MVP by multiplying the + // modevleiw and perspective matrices together + esMatrixMultiply( &userData->mvpMatrix, &modelview, &perspective ); +} + +/// +// Draw a triangle using the shader pair created in Init() +// +void Draw ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + // Set the viewport + glViewport ( 0, 0, esContext->width, esContext->height ); + + + // Clear the color buffer + glClear ( GL_COLOR_BUFFER_BIT ); + + // Use the program object + glUseProgram ( userData->programObject ); + + // Load the vertex position + glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, + GL_FALSE, 3 * sizeof(GLfloat), userData->vertices ); + + glEnableVertexAttribArray ( userData->positionLoc ); + + + // Load the MVP matrix + glUniformMatrix4fv( userData->mvpLoc, 1, GL_FALSE, (GLfloat*) &userData->mvpMatrix.m[0][0] ); + + // Draw the cube + glDrawElements ( GL_TRIANGLES, userData->numIndices, GL_UNSIGNED_INT, userData->indices ); +} + +/// +// Cleanup +// +void ShutDown ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + if ( userData->vertices != NULL ) + { + free ( userData->vertices ); + } + + if ( userData->indices != NULL ) + { + free ( userData->indices ); + } + + // Delete program object + glDeleteProgram ( userData->programObject ); + + free(userData); +} + +int main ( int argc, char *argv[] ) +{ + ESContext esContext; + UserData userData; + + esInitContext ( &esContext ); + esContext.userData = &userData; + + esCreateWindow ( &esContext, "Simple Texture 2D", 320, 240, ES_WINDOW_RGB ); + + if ( !Init ( &esContext ) ) + return 0; + + esRegisterDrawFunc ( &esContext, Draw ); + esRegisterUpdateFunc ( &esContext, Update ); + + esMainLoop ( &esContext ); + + ShutDown ( &esContext ); +} + diff --git a/tests/glbook/Chapter_9/Simple_Texture2D/Simple_Texture2D_orig.c b/tests/glbook/Chapter_9/Simple_Texture2D/Simple_Texture2D_orig.c new file mode 100644 index 00000000..cc465c9a --- /dev/null +++ b/tests/glbook/Chapter_9/Simple_Texture2D/Simple_Texture2D_orig.c @@ -0,0 +1,199 @@ +// +// Book: OpenGL(R) ES 2.0 Programming Guide +// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner +// ISBN-10: 0321502795 +// ISBN-13: 9780321502797 +// Publisher: Addison-Wesley Professional +// URLs: http://safari.informit.com/9780321563835 +// http://www.opengles-book.com +// + +// Simple_Texture2D.c +// +// This is a simple example that draws a quad with a 2D +// texture image. The purpose of this example is to demonstrate +// the basics of 2D texturing +// +#include <stdlib.h> +#include "esUtil.h" + +typedef struct +{ + // Handle to a program object + GLuint programObject; + + // Attribute locations + GLint positionLoc; + GLint texCoordLoc; + + // Sampler location + GLint samplerLoc; + + // Texture handle + GLuint textureId; + +} UserData; + +/// +// Create a simple 2x2 texture image with four different colors +// +GLuint CreateSimpleTexture2D( ) +{ + // Texture object handle + GLuint textureId; + + // 2x2 Image, 3 bytes per pixel (R, G, B) + GLubyte pixels[4 * 3] = + { + 255, 0, 0, // Red + 0, 255, 0, // Green + 0, 0, 255, // Blue + 255, 255, 0 // Yellow + }; + + // Use tightly packed data + glPixelStorei ( GL_UNPACK_ALIGNMENT, 1 ); + + // Generate a texture object + glGenTextures ( 1, &textureId ); + + // Bind the texture object + glBindTexture ( GL_TEXTURE_2D, textureId ); + + // Load the texture + glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels ); + + // Set the filtering mode + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); + + return textureId; + +} + + +/// +// Initialize the shader and program object +// +int Init ( ESContext *esContext ) +{ + esContext->userData = malloc(sizeof(UserData)); + UserData *userData = esContext->userData; + GLbyte vShaderStr[] = + "attribute vec4 a_position; \n" + "attribute vec2 a_texCoord; \n" + "varying vec2 v_texCoord; \n" + "void main() \n" + "{ \n" + " gl_Position = a_position; \n" + " v_texCoord = a_texCoord; \n" + "} \n"; + + GLbyte fShaderStr[] = + "precision mediump float; \n" + "varying vec2 v_texCoord; \n" + "uniform sampler2D s_texture; \n" + "void main() \n" + "{ \n" + " gl_FragColor = texture2D( s_texture, v_texCoord );\n" + "} \n"; + + // Load the shaders and get a linked program object + userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); + + // Get the attribute locations + userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); + userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" ); + + // Get the sampler location + userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); + + // Load the texture + userData->textureId = CreateSimpleTexture2D (); + + glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); + return GL_TRUE; +} + +/// +// Draw a triangle using the shader pair created in Init() +// +void Draw ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + GLfloat vVertices[] = { -0.5f, 0.5f, 0.0f, // Position 0 + 0.0f, 0.0f, // TexCoord 0 + -0.5f, -0.5f, 0.0f, // Position 1 + 0.0f, 1.0f, // TexCoord 1 + 0.5f, -0.5f, 0.0f, // Position 2 + 1.0f, 1.0f, // TexCoord 2 + 0.5f, 0.5f, 0.0f, // Position 3 + 1.0f, 0.0f // TexCoord 3 + }; + GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; + + // Set the viewport + glViewport ( 0, 0, esContext->width, esContext->height ); + + // Clear the color buffer + glClear ( GL_COLOR_BUFFER_BIT ); + + // Use the program object + glUseProgram ( userData->programObject ); + + // Load the vertex position + glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, + GL_FALSE, 5 * sizeof(GLfloat), vVertices ); + // Load the texture coordinate + glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT, + GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] ); + + glEnableVertexAttribArray ( userData->positionLoc ); + glEnableVertexAttribArray ( userData->texCoordLoc ); + + // Bind the texture + glActiveTexture ( GL_TEXTURE0 ); + glBindTexture ( GL_TEXTURE_2D, userData->textureId ); + + // Set the sampler texture unit to 0 + glUniform1i ( userData->samplerLoc, 0 ); + + glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); + +} + +/// +// Cleanup +// +void ShutDown ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + // Delete texture object + glDeleteTextures ( 1, &userData->textureId ); + + // Delete program object + glDeleteProgram ( userData->programObject ); + + free(esContext->userData); +} + +int main ( int argc, char *argv[] ) +{ + ESContext esContext; + UserData userData; + + esInitContext ( &esContext ); + esContext.userData = &userData; + + esCreateWindow ( &esContext, "Simple Texture 2D", 320, 240, ES_WINDOW_RGB ); + + if ( !Init ( &esContext ) ) + return 0; + + esRegisterDrawFunc ( &esContext, Draw ); + + esMainLoop ( &esContext ); + + ShutDown ( &esContext ); +} diff --git a/tests/glbook/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap_orig.c b/tests/glbook/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap_orig.c new file mode 100644 index 00000000..b981d943 --- /dev/null +++ b/tests/glbook/Chapter_9/Simple_TextureCubemap/Simple_TextureCubemap_orig.c @@ -0,0 +1,227 @@ +// +// Book: OpenGL(R) ES 2.0 Programming Guide +// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner +// ISBN-10: 0321502795 +// ISBN-13: 9780321502797 +// Publisher: Addison-Wesley Professional +// URLs: http://safari.informit.com/9780321563835 +// http://www.opengles-book.com +// + +// Simple_TextureCubemap.c +// +// This is a simple example that draws a sphere with a cubemap image applied. +// +#include <stdlib.h> +#include "esUtil.h" + +typedef struct +{ + // Handle to a program object + GLuint programObject; + + // Attribute locations + GLint positionLoc; + GLint normalLoc; + + // Sampler location + GLint samplerLoc; + + // Texture handle + GLuint textureId; + + // Vertex data + int numIndices; + GLfloat *vertices; + GLfloat *normals; + GLuint *indices; + +} UserData; + +/// +// Create a simple cubemap with a 1x1 face with a different +// color for each face +GLuint CreateSimpleTextureCubemap( ) +{ + GLuint textureId; + // Six 1x1 RGB faces + GLubyte cubePixels[6][3] = + { + // Face 0 - Red + 255, 0, 0, + // Face 1 - Green, + 0, 255, 0, + // Face 3 - Blue + 0, 0, 255, + // Face 4 - Yellow + 255, 255, 0, + // Face 5 - Purple + 255, 0, 255, + // Face 6 - White + 255, 255, 255 + }; + + // Generate a texture object + glGenTextures ( 1, &textureId ); + + // Bind the texture object + glBindTexture ( GL_TEXTURE_CUBE_MAP, textureId ); + + // Load the cube face - Positive X + glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[0] ); + + // Load the cube face - Negative X + glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[1] ); + + // Load the cube face - Positive Y + glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[2] ); + + // Load the cube face - Negative Y + glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[3] ); + + // Load the cube face - Positive Z + glTexImage2D ( GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[4] ); + + // Load the cube face - Negative Z + glTexImage2D ( GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGB, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &cubePixels[5] ); + + // Set the filtering mode + glTexParameteri ( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); + glTexParameteri ( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); + + return textureId; + +} + +#include <stdio.h> +/// +// Initialize the shader and program object +// +int Init ( ESContext *esContext ) +{ + //esContext->userData = malloc(sizeof(UserData)); + UserData *userData = esContext->userData; + GLbyte vShaderStr[] = + "attribute vec4 a_position; \n" + "attribute vec3 a_normal; \n" + "varying vec3 v_normal; \n" + "void main() \n" + "{ \n" + " gl_Position = a_position; \n" + " v_normal = a_normal; \n" + "} \n"; + + GLbyte fShaderStr[] = + "precision mediump float; \n" + "varying vec3 v_normal; \n" + "uniform samplerCube s_texture; \n" + "void main() \n" + "{ \n" + " gl_FragColor = textureCube( s_texture, v_normal );\n" + "} \n"; + + // Load the shaders and get a linked program object + userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); + + // Get the attribute locations + userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); + userData->normalLoc = glGetAttribLocation ( userData->programObject, "a_normal" ); + + // Get the sampler locations + userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); + + // Load the texture + userData->textureId = CreateSimpleTextureCubemap (); + + // Generate the vertex data + userData->numIndices = esGenSphere ( 20, 0.75f, &userData->vertices, &userData->normals, + NULL, &userData->indices ); + + glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); + return GL_TRUE; +} + +/// +// Draw a triangle using the shader pair created in Init() +// +void Draw ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + // Set the viewport + glViewport ( 0, 0, esContext->width, esContext->height ); + + // Clear the color buffer + glClear ( GL_COLOR_BUFFER_BIT ); + + glCullFace ( GL_BACK ); + glEnable ( GL_CULL_FACE ); + + // Use the program object + glUseProgram ( userData->programObject ); + + // Load the vertex position + glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT, + GL_FALSE, 0, userData->vertices ); + // Load the normal + glVertexAttribPointer ( userData->normalLoc, 3, GL_FLOAT, + GL_FALSE, 0, userData->normals ); + + glEnableVertexAttribArray ( userData->positionLoc ); + glEnableVertexAttribArray ( userData->normalLoc ); + + // Bind the texture + glActiveTexture ( GL_TEXTURE0 ); + glBindTexture ( GL_TEXTURE_CUBE_MAP, userData->textureId ); + + // Set the sampler texture unit to 0 + glUniform1i ( userData->samplerLoc, 0 ); + + glDrawElements ( GL_TRIANGLES, userData->numIndices, + GL_UNSIGNED_INT, userData->indices ); +} + +/// +// Cleanup +// +void ShutDown ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + // Delete texture object + glDeleteTextures ( 1, &userData->textureId ); + + // Delete program object + glDeleteProgram ( userData->programObject ); + + free ( userData->vertices ); + free ( userData->normals ); + + //free ( esContext->userData); +} + +int main ( int argc, char *argv[] ) +{ + ESContext esContext; + UserData userData; + + esInitContext ( &esContext ); + esContext.userData = &userData; + + esCreateWindow ( &esContext, "Simple Texture Cubemap", 320, 240, ES_WINDOW_RGB ); + + if ( !Init ( &esContext ) ) + return 0; + + esRegisterDrawFunc ( &esContext, Draw ); + + esMainLoop ( &esContext ); + + ShutDown ( &esContext ); +} diff --git a/tests/glbook/Chapter_9/TextureWrap/TextureWrap_orig.c b/tests/glbook/Chapter_9/TextureWrap/TextureWrap_orig.c new file mode 100644 index 00000000..fe22282f --- /dev/null +++ b/tests/glbook/Chapter_9/TextureWrap/TextureWrap_orig.c @@ -0,0 +1,257 @@ +// +// Book: OpenGL(R) ES 2.0 Programming Guide +// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner +// ISBN-10: 0321502795 +// ISBN-13: 9780321502797 +// Publisher: Addison-Wesley Professional +// URLs: http://safari.informit.com/9780321563835 +// http://www.opengles-book.com +// + +// TextureWrap.c +// +// This is an example that demonstrates the three texture +// wrap modes available on 2D textures +// +#include <stdlib.h> +#include "esUtil.h" + +typedef struct +{ + // Handle to a program object + GLuint programObject; + + // Attribute locations + GLint positionLoc; + GLint texCoordLoc; + + // Sampler location + GLint samplerLoc; + + // Offset location + GLint offsetLoc; + + // Texture handle + GLuint textureId; + +} UserData; + +/// +// Generate an RGB8 checkerboard image +// +GLubyte* GenCheckImage( int width, int height, int checkSize ) +{ + int x, + y; + GLubyte *pixels = malloc( width * height * 3 ); + + if ( pixels == NULL ) + return NULL; + + for ( y = 0; y < height; y++ ) + for ( x = 0; x < width; x++ ) + { + GLubyte rColor = 0; + GLubyte bColor = 0; + + if ( ( x / checkSize ) % 2 == 0 ) + { + rColor = 255 * ( ( y / checkSize ) % 2 ); + bColor = 255 * ( 1 - ( ( y / checkSize ) % 2 ) ); + } + else + { + bColor = 255 * ( ( y / checkSize ) % 2 ); + rColor = 255 * ( 1 - ( ( y / checkSize ) % 2 ) ); + } + + pixels[(y * height + x) * 3] = rColor; + pixels[(y * height + x) * 3 + 1] = 0; + pixels[(y * height + x) * 3 + 2] = bColor; + } + + return pixels; +} + +/// +// Create a mipmapped 2D texture image +// +GLuint CreateTexture2D( ) +{ + // Texture object handle + GLuint textureId; + int width = 256, + height = 256; + GLubyte *pixels; + + pixels = GenCheckImage( width, height, 64 ); + if ( pixels == NULL ) + return 0; + + // Generate a texture object + glGenTextures ( 1, &textureId ); + + // Bind the texture object + glBindTexture ( GL_TEXTURE_2D, textureId ); + + // Load mipmap level 0 + glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, + 0, GL_RGB, GL_UNSIGNED_BYTE, pixels ); + + // Set the filtering mode + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); + + return textureId; + +} + + +/// +// Initialize the shader and program object +// +int Init ( ESContext *esContext ) +{ + esContext->userData = malloc(sizeof(UserData)); + + UserData *userData = esContext->userData; + GLbyte vShaderStr[] = + "uniform float u_offset; \n" + "attribute vec4 a_position; \n" + "attribute vec2 a_texCoord; \n" + "varying vec2 v_texCoord; \n" + "void main() \n" + "{ \n" + " gl_Position = a_position; \n" + " gl_Position.x += u_offset;\n" + " v_texCoord = a_texCoord; \n" + "} \n"; + + GLbyte fShaderStr[] = + "precision mediump float; \n" + "varying vec2 v_texCoord; \n" + "uniform sampler2D s_texture; \n" + "void main() \n" + "{ \n" + " gl_FragColor = texture2D( s_texture, v_texCoord );\n" + "} \n"; + + // Load the shaders and get a linked program object + userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); + + // Get the attribute locations + userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); + userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" ); + + // Get the sampler location + userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); + + // Get the offset location + userData->offsetLoc = glGetUniformLocation( userData->programObject, "u_offset" ); + + // Load the texture + userData->textureId = CreateTexture2D (); + + glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); + return GL_TRUE; +} + +/// +// Draw a triangle using the shader pair created in Init() +// +void Draw ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + GLfloat vVertices[] = { -0.3f, 0.3f, 0.0f, 1.0f, // Position 0 + -1.0f, -1.0f, // TexCoord 0 + -0.3f, -0.3f, 0.0f, 1.0f, // Position 1 + -1.0f, 2.0f, // TexCoord 1 + 0.3f, -0.3f, 0.0f, 1.0f, // Position 2 + 2.0f, 2.0f, // TexCoord 2 + 0.3f, 0.3f, 0.0f, 1.0f, // Position 3 + 2.0f, -1.0f // TexCoord 3 + }; + GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; + + // Set the viewport + glViewport ( 0, 0, esContext->width, esContext->height ); + + // Clear the color buffer + glClear ( GL_COLOR_BUFFER_BIT ); + + // Use the program object + glUseProgram ( userData->programObject ); + + // Load the vertex position + glVertexAttribPointer ( userData->positionLoc, 4, GL_FLOAT, + GL_FALSE, 6 * sizeof(GLfloat), vVertices ); + // Load the texture coordinate + glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT, + GL_FALSE, 6 * sizeof(GLfloat), &vVertices[4] ); + + glEnableVertexAttribArray ( userData->positionLoc ); + glEnableVertexAttribArray ( userData->texCoordLoc ); + + // Bind the texture + glActiveTexture ( GL_TEXTURE0 ); + glBindTexture ( GL_TEXTURE_2D, userData->textureId ); + + // Set the sampler texture unit to 0 + glUniform1i ( userData->samplerLoc, 0 ); + + // Draw quad with repeat wrap mode + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ); + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ); + glUniform1f ( userData->offsetLoc, -0.7f ); + glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); + + // Draw quad with clamp to edge wrap mode + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE ); + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE ); + glUniform1f ( userData->offsetLoc, 0.0f ); + glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); + + // Draw quad with mirrored repeat + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT ); + glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT ); + glUniform1f ( userData->offsetLoc, 0.7f ); + glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); + +} + +/// +// Cleanup +// +void ShutDown ( ESContext *esContext ) +{ + UserData *userData = esContext->userData; + + // Delete texture object + glDeleteTextures ( 1, &userData->textureId ); + + // Delete program object + glDeleteProgram ( userData->programObject ); + + free ( esContext->userData); +} + +int main ( int argc, char *argv[] ) +{ + ESContext esContext; + UserData userData; + + esInitContext ( &esContext ); + esContext.userData = &userData; + + esCreateWindow ( &esContext, "MipMap 2D", 640, 480, ES_WINDOW_RGB ); + + if ( !Init ( &esContext ) ) + return 0; + + esRegisterDrawFunc ( &esContext, Draw ); + + esMainLoop ( &esContext ); + + ShutDown ( &esContext ); +} + |