/* THIS WORK, INCLUDING THE SOURCE CODE, DOCUMENTATION AND RELATED MEDIA AND DATA, IS PLACED INTO THE PUBLIC DOMAIN. THE ORIGINAL AUTHOR IS KYLE FOLEY. THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR REDISTRIBUTION OF THIS SOFTWARE. */ #if !EMSCRIPTEN #define USE_GLEW 1 #endif #if USE_GLEW #include "GL/glew.h" #endif #include "SDL/SDL.h" #if !USE_GLEW #include "SDL/SDL_opengl.h" #endif #include #include #include PFNGLGENVERTEXARRAYSPROC glGenVertexArrays_ = NULL; PFNGLBINDVERTEXARRAYPROC glBindVertexArray_ = NULL; PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays_ = NULL; int main(int argc, char *argv[]) { SDL_Surface *screen; if ( SDL_Init(SDL_INIT_VIDEO) != 0 ) { printf("Unable to initialize SDL: %s\n", SDL_GetError()); return 1; } SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); screen = SDL_SetVideoMode( 640, 480, 24, SDL_OPENGL ); if ( !screen ) { printf("Unable to set video mode: %s\n", SDL_GetError()); return 1; } glClearColor( 0, 0, 0, 0 ); glClear( GL_COLOR_BUFFER_BIT ); glGenVertexArrays_ = (PFNGLGENVERTEXARRAYSPROC) SDL_GL_GetProcAddress("glGenVertexArrays"); assert(glGenVertexArrays_); glBindVertexArray_ = (PFNGLBINDVERTEXARRAYPROC) SDL_GL_GetProcAddress("glBindVertexArray"); assert(glBindVertexArray_); glDeleteVertexArrays_ = (PFNGLDELETEVERTEXARRAYSPROC) SDL_GL_GetProcAddress("glDeleteVertexArrays"); assert(glDeleteVertexArrays_); glEnableClientState(GL_TEXTURE_COORD_ARRAY); // enabling it *before* the vao does nothing, the vao should wipe it out! // Generate a VAO GLuint vao; glGenVertexArrays_(1, &vao); glBindVertexArray_(vao); // Create a texture GLuint texture; glGenTextures( 1, &texture ); glBindTexture( GL_TEXTURE_2D, texture ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); GLubyte textureData[16*16*4]; for (int x = 0; x < 16; x++) { for (int y = 0; y < 16; y++) { *((int*)&textureData[(x*16 + y) * 4]) = x*16 + ((y*16) << 8); } } glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE, textureData ); // Create a second texture GLuint texture2; glGenTextures( 1, &texture2 ); glBindTexture( GL_TEXTURE_2D, texture2 ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); GLubyte texture2Data[] = { 0xff, 0, 0, 0xff, 0, 0xff, 0, 0xaa, 0, 0, 0xff, 0x55, 0x80, 0x90, 0x70, 0 }; glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture2Data ); // BEGIN #if USE_GLEW glewInit(); #endif glMatrixMode(GL_PROJECTION); glLoadIdentity(); // original: glFrustum(-0.6435469817188064, 0.6435469817188064 ,-0.48266022190470925, 0.48266022190470925 ,0.5400000214576721, 2048); //glFrustum(-0.6435469817188064, 0.1435469817188064 ,-0.48266022190470925, 0.88266022190470925 ,0.5400000214576721, 2048); GLfloat pm[] = { 1.372136116027832, 0, 0, 0, 0, 0.7910231351852417, 0, 0, -0.6352481842041016, 0.29297152161598206, -1.0005275011062622, -1, 0, 0, -1.080284833908081, 0 }; glLoadMatrixf(pm); glMatrixMode(GL_MODELVIEW); GLfloat matrixData[] = { -1, 0, 0, 0, 0, 0,-1, 0, 0, 1, 0, 0, 0, 0, 0, 1 }; glLoadMatrixf(matrixData); //glTranslated(-512,-512,-527); // XXX this should be uncommented, but if it is then nothing is shown // glEnable(GL_CULL_FACE); // glEnable(GL_DEPTH_TEST); //glClear(GL_DEPTH_BUFFER_BIT); // glEnableClientState(GL_NORMAL_ARRAY); // glEnableClientState(GL_COLOR_ARRAY); glActiveTexture(GL_TEXTURE0); glEnableClientState(GL_VERTEX_ARRAY); GLuint arrayBuffer, elementBuffer; glGenBuffers(1, &arrayBuffer); glGenBuffers(1, &elementBuffer); GLubyte arrayData[] = { /* [0, 0, 0, 67] ==> 128 float [0, 0, 128, 67] ==> 256 float [0, 0, 0, 68] ==> 512 float [0, 0, 128, 68] ==> 1024 float [vertex x ] [vertex y ] [vertex z ] [nr] [texture u ] [texture v ] [lm u ] [lm v ] [color r,g,b,a ] */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, // 0 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, // 1 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 2 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 3 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, // 4 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 67, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, // 5 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 6 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 7 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 8 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 9 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 128, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 10 0, 0, 0, 0, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 11 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 12 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 67, 0, 0, 0, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 13 0, 0, 128, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 67, 0, 0, 128, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 14 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 67, 0, 0, 128, 67, 0, 0, 0, 0, 128, 128, 128, 128, // 15 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 0, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 128, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128, 0, 0, 128, 68, 0, 0, 128, 68, 0, 0, 0, 68, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 128, 128, 128 }; assert(sizeof(arrayData) == 1408); glBindBuffer(GL_ARRAY_BUFFER, arrayBuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(arrayData), arrayData, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); GLushort elementData[] = { 1, 2, 0, 2, 3, 0, 5, 6, 4, 6, 7, 4, 9, 10, 8, 10, 11, 8, 13, 14, 12, 14, 15, 12 }; assert(sizeof(elementData) == 48); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elementData), elementData, GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glBindBuffer(GL_ARRAY_BUFFER, arrayBuffer); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBuffer); // sauer vertex data is apparently 0-12: V3F, 12: N1B, 16-24: T2F, 24-28: T2S, 28-32: C4B glVertexPointer(3, GL_FLOAT, 32, (void*)0); // all these apply to the ARRAY_BUFFER that is bound glTexCoordPointer(2, GL_FLOAT, 32, (void*)16); // glClientActiveTexture(GL_TEXTURE1); // XXX seems to be ignored in native build // glTexCoordPointer(2, GL_SHORT, 32, (void*)24); // glClientActiveTexture(GL_TEXTURE0); // likely not needed, it is a cleanup // glNormalPointer(GL_BYTE, 32, (void*)12); // glColorPointer(4, GL_UNSIGNED_BYTE, 32, (void*)28); glBindTexture(GL_TEXTURE_2D, texture); // diffuse? glActiveTexture(GL_TEXTURE0); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, texture2); // lightmap? glActiveTexture(GL_TEXTURE0); GLint ok; const char *vertexShader = "uniform mat4 u_modelView;\n" "uniform mat4 u_projection;\n" "varying vec4 v_texCoord0;\n" "void main(void)\n" "{\n" // (gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex) // (u_projection * u_modelView * a_position) " gl_Position = (u_projection * u_modelView * gl_Vertex) + vec4(200, 0, 0, 0);\n" " v_texCoord0.xy = gl_MultiTexCoord0.xy/20.0;\n" // added /100 here "}\n"; const char *fragmentShader = "uniform sampler2D diffusemap;\n" "varying vec4 v_texCoord0;\n" "void main(void)\n" "{\n" " vec4 diffuse = texture2D(diffusemap, v_texCoord0.xy);\n" " gl_FragColor = diffuse;\n" "}\n"; GLuint vs = glCreateShader(GL_VERTEX_SHADER); glShaderSource(vs, 1, &vertexShader, NULL); glCompileShader(vs); glGetShaderiv(vs, GL_COMPILE_STATUS, &ok); if (!ok) { printf("Shader compilation error with vertex\n"); GLint infoLen = 0; glGetShaderiv (vs, GL_INFO_LOG_LENGTH, &infoLen); if (infoLen > 1) { char* infoLog = (char *)malloc(sizeof(char) * infoLen+1); glGetShaderInfoLog(vs, infoLen, NULL, infoLog); printf("Error compiling shader:\n%s\n", infoLog); } } GLuint fs = glCreateShader(GL_FRAGMENT_SHADER); glShaderSource(fs, 1, &fragmentShader, NULL); glCompileShader(fs); glGetShaderiv(fs, GL_COMPILE_STATUS, &ok); if (!ok) { printf("Shader compilation error with fragment\n"); GLint infoLen = 0; glGetShaderiv (vs, GL_INFO_LOG_LENGTH, &infoLen); if (infoLen > 1) { char* infoLog = (char *)malloc(sizeof(char) * infoLen+1); glGetShaderInfoLog(vs, infoLen, NULL, infoLog); printf("Error compiling shader:\n%s\n", infoLog); } } GLuint program = glCreateProgram(); glAttachShader(program, vs); glAttachShader(program, fs); glLinkProgram(program); glGetProgramiv(program, GL_LINK_STATUS, &ok); assert(ok); glUseProgram(program); //GLint lightmapLocation = glGetUniformLocation(program, "lightmap"); //assert(lightmapLocation >= 0); //glUniform1i(lightmapLocation, 1); // sampler2D? Is it the texture unit? GLint diffusemapLocation = glGetUniformLocation(program, "diffusemap"); assert(diffusemapLocation >= 0); glUniform1i(diffusemapLocation, 0); //GLint texgenscrollLocation = glGetUniformLocation(program, "texgenscroll"); //assert(texgenscrollLocation >= 0); //GLint colorparamsLocation = glGetUniformLocation(program, "colorparams"); //assert(colorparamsLocation >= 0); //GLfloat texgenscrollData[] = { 0, 0, 0, 0 }; //glUniform4fv(texgenscrollLocation, 1, texgenscrollData); //GLfloat colorparamsData[] = { 2, 2, 2, 1 }; //glUniform4fv(colorparamsLocation, 1, colorparamsData); { GLfloat data[16]; glGetFloatv(GL_MODELVIEW_MATRIX, data); printf("Modelview: "); for (int i = 0; i < 16; i++) printf("%.3f, ", data[i]); printf("\n"); //memset(data, 0, 16*4); GLint modelViewLocation = glGetUniformLocation(program, "u_modelView"); assert(modelViewLocation >= 0); glUniformMatrix4fv(modelViewLocation, 1, GL_FALSE, data); } { GLfloat data[16]; glGetFloatv(GL_PROJECTION_MATRIX, data); printf("Projection: "); for (int i = 0; i < 16; i++) printf("%.3f, ", data[i]); printf("\n"); //memset(data, 0, 16*4); GLint projectionLocation = glGetUniformLocation(program, "u_projection"); assert(projectionLocation >= 0); glUniformMatrix4fv(projectionLocation, 1, GL_FALSE, data); } /* glBindAttribLocation(program, 0, "a_position"); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 32, (void*)0); glEnableVertexAttribArray(0); glBindAttribLocation(program, 1, "v_texCoord0"); glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 32, (void*)16); glEnableVertexAttribArray(1); */ // stop recording in the VAO glBindVertexArray_(0); // unbind all the stuff the VAO would save for us, so this is a valid test glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_VERTEX_ARRAY); // draw with VAO glBindVertexArray_(vao); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, (void*)12); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, (void*) 0); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, (void*)24); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, (void*)36); // END SDL_GL_SwapBuffers(); #if !EMSCRIPTEN SDL_Delay(1500); #endif // SDL_Quit(); return 0; }