aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--src/library_gl.js27
-rw-r--r--src/library_glut.js8
-rw-r--r--tests/cube2hash/readme.txt27
-rw-r--r--tests/glbook/CH09_TextureWrap.pngbin0 -> 1812 bytes
-rw-r--r--tests/glbook/CH10_MultiTexture.pngbin0 -> 59495 bytes
-rw-r--r--tests/glbook/Chapter_10/MultiTexture/MultiTexture.c44
-rw-r--r--tests/glbook/Chapter_9/TextureWrap/TextureWrap.c54
-rw-r--r--tests/glbook/Makefile4
-rw-r--r--tests/hello_world_gles_deriv.c730
-rwxr-xr-xtests/runner.py60
10 files changed, 912 insertions, 42 deletions
diff --git a/src/library_gl.js b/src/library_gl.js
index 85c0290e..6f99969e 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -436,6 +436,33 @@ var LibraryGL = {
Module.ctx.uniform4i(location, v0, v1, v2, v3);
},
+ glUniform1iv: function(location, count, value) {
+ location = GL.uniforms[location];
+ value = new Int32Array(TypedArray_copy(value, count*4)); // TODO: optimize
+ Module.ctx.uniform1iv(location, value);
+ },
+
+ glUniform2iv: function(location, count, value) {
+ location = GL.uniforms[location];
+ count *= 2;
+ value = new Int32Array(TypedArray_copy(value, count*4)); // TODO: optimize
+ Module.ctx.uniform2iv(location, value);
+ },
+
+ glUniform3iv: function(location, count, value) {
+ location = GL.uniforms[location];
+ count *= 3;
+ value = new Int32Array(TypedArray_copy(value, count*4)); // TODO: optimize
+ Module.ctx.uniform3iv(location, value);
+ },
+
+ glUniform4iv: function(location, count, value) {
+ location = GL.uniforms[location];
+ count *= 4;
+ value = new Int32Array(TypedArray_copy(value, count*4)); // TODO: optimize
+ Module.ctx.uniform4iv(location, value);
+ },
+
glUniform1fv: function(location, count, value) {
location = GL.uniforms[location];
value = new Float32Array(TypedArray_copy(value, count*4)); // TODO: optimize
diff --git a/src/library_glut.js b/src/library_glut.js
index 51d87a34..bbcba7d4 100644
--- a/src/library_glut.js
+++ b/src/library_glut.js
@@ -323,6 +323,7 @@ var LibraryGLUT = {
var ctx = Module["canvas"].getContext('experimental-webgl');
if (!ctx) throw 'Could not create canvas :(';
#if GL_DEBUG
+ // Useful to debug native webgl apps: var Module = { printErr: function(x) { console.log(x) } };
var wrapper = {};
wrapper.objectMap = new WeakMap();
wrapper.objectCounter = 1;
@@ -333,7 +334,12 @@ var LibraryGLUT = {
wrapper[prop] = function() {
var printArgs = Array.prototype.slice.call(arguments).map(function(arg) {
if (wrapper.objectMap[arg]) return '<' + arg + '|' + wrapper.objectMap[arg] + '>';
- if (arg.subarray) return '{' + arg + '|' + arg.length /*+ '|' + Array.prototype.slice.call(arg).toString().replace(/,/g, ', ')*/ + '}';
+ if (arg.byteLength) {
+ var ret = '{' + arg.byteLength + ':';
+ var arr = Array.prototype.slice.call(new Uint8Array(arg.buffer), 0, 40);
+ ret += arr.toString().replace(/,/g, ', ') + '}';
+ return ret;
+ }
return arg;
});
Module.printErr('[gl_f:' + prop + ':' + printArgs + ']');
diff --git a/tests/cube2hash/readme.txt b/tests/cube2hash/readme.txt
new file mode 100644
index 00000000..6eb129c2
--- /dev/null
+++ b/tests/cube2hash/readme.txt
@@ -0,0 +1,27 @@
+This directory contains zlib code (c) the Cube 2/Sauerbraten project.
+http://sauerbraten.org/
+
+LICENSE
+=======
+
+Sauerbraten game engine source code, any release.
+
+Copyright (C) 2001-2009 Wouter van Oortmerssen, Lee Salzman, Mike Dysart, Robert Pointon, and Quinton Reeves
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+
diff --git a/tests/glbook/CH09_TextureWrap.png b/tests/glbook/CH09_TextureWrap.png
new file mode 100644
index 00000000..3367e254
--- /dev/null
+++ b/tests/glbook/CH09_TextureWrap.png
Binary files differ
diff --git a/tests/glbook/CH10_MultiTexture.png b/tests/glbook/CH10_MultiTexture.png
new file mode 100644
index 00000000..8e006eb3
--- /dev/null
+++ b/tests/glbook/CH10_MultiTexture.png
Binary files differ
diff --git a/tests/glbook/Chapter_10/MultiTexture/MultiTexture.c b/tests/glbook/Chapter_10/MultiTexture/MultiTexture.c
index 5324ad92..61bda608 100644
--- a/tests/glbook/Chapter_10/MultiTexture/MultiTexture.c
+++ b/tests/glbook/Chapter_10/MultiTexture/MultiTexture.c
@@ -33,6 +33,8 @@ typedef struct
GLuint baseMapTexId;
GLuint lightMapTexId;
+ GLuint vertexObject, indexObject;
+
} UserData;
@@ -117,7 +119,27 @@ int Init ( ESContext *esContext )
if ( userData->baseMapTexId == 0 || userData->lightMapTexId == 0 )
return FALSE;
- glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
+ GLfloat vVertices[] = { -0.5, 0.5, 0.0, // Position 0
+ 0.0, 0.0, // TexCoord 0
+ -0.5, -0.5, 0.0, // Position 1
+ 0.0, 1.0, // TexCoord 1
+ 0.5, -0.5, 0.0, // Position 2
+ 1.0, 1.0, // TexCoord 2
+ 0.5, 0.5, 0.0, // Position 3
+ 1.0, 0.0 // TexCoord 3
+ };
+ GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
+
+ glGenBuffers(1, &userData->vertexObject);
+ glBindBuffer ( GL_ARRAY_BUFFER, userData->vertexObject );
+ glBufferData ( GL_ARRAY_BUFFER, 5 * 4 * 4, vVertices, GL_STATIC_DRAW );
+
+ glGenBuffers(1, &userData->indexObject);
+ glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->indexObject );
+ glBufferData ( GL_ELEMENT_ARRAY_BUFFER, 6 * 2, indices, GL_STATIC_DRAW );
+
+ glClearColor ( 0.0, 0.0, 0.0, 1.0 );
+
return TRUE;
}
@@ -127,17 +149,7 @@ int Init ( ESContext *esContext )
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 );
@@ -148,11 +160,12 @@ void Draw ( ESContext *esContext )
glUseProgram ( userData->programObject );
// Load the vertex position
+ glBindBuffer ( GL_ARRAY_BUFFER, userData->vertexObject );
glVertexAttribPointer ( userData->positionLoc, 3, GL_FLOAT,
- GL_FALSE, 5 * sizeof(GLfloat), vVertices );
+ GL_FALSE, 5 * sizeof(GLfloat), 0 );
// Load the texture coordinate
glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT,
- GL_FALSE, 5 * sizeof(GLfloat), &vVertices[3] );
+ GL_FALSE, 5 * sizeof(GLfloat), 3 * sizeof(GLfloat) );
glEnableVertexAttribArray ( userData->positionLoc );
glEnableVertexAttribArray ( userData->texCoordLoc );
@@ -171,7 +184,8 @@ void Draw ( ESContext *esContext )
// Set the light map sampler to texture unit 1
glUniform1i ( userData->lightMapLoc, 1 );
- glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices );
+ glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->indexObject );
+ glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
}
diff --git a/tests/glbook/Chapter_9/TextureWrap/TextureWrap.c b/tests/glbook/Chapter_9/TextureWrap/TextureWrap.c
index fe22282f..30f39444 100644
--- a/tests/glbook/Chapter_9/TextureWrap/TextureWrap.c
+++ b/tests/glbook/Chapter_9/TextureWrap/TextureWrap.c
@@ -34,6 +34,8 @@ typedef struct
// Texture handle
GLuint textureId;
+ GLuint vertexObject, indexObject;
+
} UserData;
///
@@ -88,6 +90,9 @@ GLuint CreateTexture2D( )
if ( pixels == NULL )
return 0;
+ // Use tightly packed data
+ glPixelStorei ( GL_UNPACK_ALIGNMENT, 1 );
+
// Generate a texture object
glGenTextures ( 1, &textureId );
@@ -152,7 +157,28 @@ int Init ( ESContext *esContext )
// Load the texture
userData->textureId = CreateTexture2D ();
- glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
+ // Setup the vertex data
+ GLfloat vVertices[] = { -0.3, 0.3, 0.0, 1.0, // Position 0
+ -1.0, -1.0, // TexCoord 0
+ -0.3, -0.3, 0.0, 1.0, // Position 1
+ -1.0, 2.0, // TexCoord 1
+ 0.3, -0.3, 0.0, 1.0, // Position 2
+ 2.0, 2.0, // TexCoord 2
+ 0.3, 0.3, 0.0, 1.0, // Position 3
+ 2.0, -1.0 // TexCoord 3
+ };
+ GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
+
+ glGenBuffers(1, &userData->vertexObject);
+ glBindBuffer ( GL_ARRAY_BUFFER, userData->vertexObject );
+ glBufferData ( GL_ARRAY_BUFFER, 6 * 4 * 4, vVertices, GL_STATIC_DRAW );
+
+ glGenBuffers(1, &userData->indexObject);
+ glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->indexObject );
+ glBufferData ( GL_ELEMENT_ARRAY_BUFFER, 6 * 2, indices, GL_STATIC_DRAW );
+
+ glClearColor ( 0.0, 0.0, 0.0, 1.0 );
+
return GL_TRUE;
}
@@ -162,17 +188,7 @@ int Init ( ESContext *esContext )
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 );
@@ -183,11 +199,12 @@ void Draw ( ESContext *esContext )
glUseProgram ( userData->programObject );
// Load the vertex position
+ glBindBuffer ( GL_ARRAY_BUFFER, userData->vertexObject );
glVertexAttribPointer ( userData->positionLoc, 4, GL_FLOAT,
- GL_FALSE, 6 * sizeof(GLfloat), vVertices );
+ GL_FALSE, 6 * sizeof(GLfloat), 0 );
// Load the texture coordinate
glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT,
- GL_FALSE, 6 * sizeof(GLfloat), &vVertices[4] );
+ GL_FALSE, 6 * sizeof(GLfloat), 4 * sizeof(GLfloat) );
glEnableVertexAttribArray ( userData->positionLoc );
glEnableVertexAttribArray ( userData->texCoordLoc );
@@ -203,19 +220,20 @@ void Draw ( ESContext *esContext )
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 );
+ glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->indexObject );
+ glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
// 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 );
+ glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
// 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 );
+ glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
}
@@ -243,7 +261,7 @@ int main ( int argc, char *argv[] )
esInitContext ( &esContext );
esContext.userData = &userData;
- esCreateWindow ( &esContext, "MipMap 2D", 640, 480, ES_WINDOW_RGB );
+ esCreateWindow ( &esContext, "MipMap 2D", 320, 240, ES_WINDOW_RGB );
if ( !Init ( &esContext ) )
return 0;
diff --git a/tests/glbook/Makefile b/tests/glbook/Makefile
index df8b1615..cd5f8aee 100644
--- a/tests/glbook/Makefile
+++ b/tests/glbook/Makefile
@@ -27,8 +27,8 @@ all: ./Chapter_2/Hello_Triangle/CH02_HelloTriangle.bc \
./Chapter_9/Simple_Texture2D/CH09_SimpleTexture2D.bc \
./Chapter_9/MipMap2D/CH09_MipMap2D.bc \
./Chapter_9/Simple_TextureCubemap/CH09_TextureCubemap.bc \
-# ./Chapter_9/TextureWrap/CH09_TextureWrap.bc \
-# ./Chapter_10/MultiTexture/CH10_MultiTexture.bc \
+ ./Chapter_9/TextureWrap/CH09_TextureWrap.bc \
+ ./Chapter_10/MultiTexture/CH10_MultiTexture.bc \
# ./Chapter_11/Multisample/CH11_Multisample.bc \
# ./Chapter_11/Stencil_Test/CH11_Stencil_Test.bc \
# ./Chapter_13/ParticleSystem/CH13_ParticleSystem.bc
diff --git a/tests/hello_world_gles_deriv.c b/tests/hello_world_gles_deriv.c
new file mode 100644
index 00000000..2e0f0664
--- /dev/null
+++ b/tests/hello_world_gles_deriv.c
@@ -0,0 +1,730 @@
+/*
+ * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Ported to GLES2.
+ * Kristian Høgsberg <krh@bitplanet.net>
+ * May 3, 2010
+ *
+ * Improve GLES2 port:
+ * * Refactor gear drawing.
+ * * Use correct normals for surfaces.
+ * * Improve shader.
+ * * Use perspective projection transformation.
+ * * Add FPS count.
+ * * Add comments.
+ * Alexandros Frantzis <alexandros.frantzis@linaro.org>
+ * Jul 13, 2010
+ */
+
+#define GL_GLEXT_PROTOTYPES
+#define EGL_EGLEXT_PROTOTYPES
+
+#define _GNU_SOURCE
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <GL/gl.h>
+#include <GL/glut.h>
+
+#ifndef HAVE_BUILTIN_SINCOS
+#include "sincos.h"
+#endif
+
+#define STRIPS_PER_TOOTH 7
+#define VERTICES_PER_TOOTH 34
+#define GEAR_VERTEX_STRIDE 6
+
+/**
+ * Struct describing the vertices in triangle strip
+ */
+struct vertex_strip {
+ /** The first vertex in the strip */
+ GLint first;
+ /** The number of consecutive vertices in the strip after the first */
+ GLint count;
+};
+
+/* Each vertex consist of GEAR_VERTEX_STRIDE GLfloat attributes */
+typedef GLfloat GearVertex[GEAR_VERTEX_STRIDE];
+
+/**
+ * Struct representing a gear.
+ */
+struct gear {
+ /** The array of vertices comprising the gear */
+ GearVertex *vertices;
+ /** The number of vertices comprising the gear */
+ int nvertices;
+ /** The array of triangle strips comprising the gear */
+ struct vertex_strip *strips;
+ /** The number of triangle strips comprising the gear */
+ int nstrips;
+ /** The Vertex Buffer Object holding the vertices in the graphics card */
+ GLuint vbo;
+};
+
+/** The view rotation [x, y, z] */
+static GLfloat view_rot[3] = { 20.0, 30.0, 0.0 };
+/** The gears */
+static struct gear *gear1, *gear2, *gear3;
+/** The current gear rotation angle */
+static GLfloat angle = 0.0;
+/** The location of the shader uniforms */
+static GLuint ModelViewProjectionMatrix_location,
+ NormalMatrix_location,
+ LightSourcePosition_location,
+ MaterialColor_location;
+/** The projection matrix */
+static GLfloat ProjectionMatrix[16];
+/** The direction of the directional light for the scene */
+static const GLfloat LightSourcePosition[4] = { 5.0, 5.0, 10.0, 1.0};
+
+/**
+ * Fills a gear vertex.
+ *
+ * @param v the vertex to fill
+ * @param x the x coordinate
+ * @param y the y coordinate
+ * @param z the z coortinate
+ * @param n pointer to the normal table
+ *
+ * @return the operation error code
+ */
+static GearVertex *
+vert(GearVertex *v, GLfloat x, GLfloat y, GLfloat z, GLfloat n[3])
+{
+ v[0][0] = x;
+ v[0][1] = y;
+ v[0][2] = z;
+ v[0][3] = n[0];
+ v[0][4] = n[1];
+ v[0][5] = n[2];
+
+ return v + 1;
+}
+
+/**
+ * Create a gear wheel.
+ *
+ * @param inner_radius radius of hole at center
+ * @param outer_radius radius at center of teeth
+ * @param width width of gear
+ * @param teeth number of teeth
+ * @param tooth_depth depth of tooth
+ *
+ * @return pointer to the constructed struct gear
+ */
+static struct gear *
+create_gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
+ GLint teeth, GLfloat tooth_depth)
+{
+ GLfloat r0, r1, r2;
+ GLfloat da;
+ GearVertex *v;
+ struct gear *gear;
+ double s[5], c[5];
+ GLfloat normal[3];
+ int cur_strip = 0;
+ int i;
+
+ /* Allocate memory for the gear */
+ gear = malloc(sizeof *gear);
+ if (gear == NULL)
+ return NULL;
+
+ /* Calculate the radii used in the gear */
+ r0 = inner_radius;
+ r1 = outer_radius - tooth_depth / 2.0;
+ r2 = outer_radius + tooth_depth / 2.0;
+
+ da = 2.0 * M_PI / teeth / 4.0;
+
+ /* Allocate memory for the triangle strip information */
+ gear->nstrips = STRIPS_PER_TOOTH * teeth;
+ gear->strips = calloc(gear->nstrips, sizeof (*gear->strips));
+
+ /* Allocate memory for the vertices */
+ gear->vertices = calloc(VERTICES_PER_TOOTH * teeth, sizeof(*gear->vertices));
+ v = gear->vertices;
+
+ for (i = 0; i < teeth; i++) {
+ /* Calculate needed sin/cos for varius angles */
+ sincos(i * 2.0 * M_PI / teeth, &s[0], &c[0]);
+ sincos(i * 2.0 * M_PI / teeth + da, &s[1], &c[1]);
+ sincos(i * 2.0 * M_PI / teeth + da * 2, &s[2], &c[2]);
+ sincos(i * 2.0 * M_PI / teeth + da * 3, &s[3], &c[3]);
+ sincos(i * 2.0 * M_PI / teeth + da * 4, &s[4], &c[4]);
+
+ /* A set of macros for making the creation of the gears easier */
+#define GEAR_POINT(r, da) { (r) * c[(da)], (r) * s[(da)] }
+#define SET_NORMAL(x, y, z) do { \
+ normal[0] = (x); normal[1] = (y); normal[2] = (z); \
+} while(0)
+
+#define GEAR_VERT(v, point, sign) vert((v), p[(point)].x, p[(point)].y, (sign) * width * 0.5, normal)
+
+#define START_STRIP do { \
+ gear->strips[cur_strip].first = v - gear->vertices; \
+} while(0);
+
+#define END_STRIP do { \
+ int _tmp = (v - gear->vertices); \
+ gear->strips[cur_strip].count = _tmp - gear->strips[cur_strip].first; \
+ cur_strip++; \
+} while (0)
+
+#define QUAD_WITH_NORMAL(p1, p2) do { \
+ SET_NORMAL((p[(p1)].y - p[(p2)].y), -(p[(p1)].x - p[(p2)].x), 0); \
+ v = GEAR_VERT(v, (p1), -1); \
+ v = GEAR_VERT(v, (p1), 1); \
+ v = GEAR_VERT(v, (p2), -1); \
+ v = GEAR_VERT(v, (p2), 1); \
+} while(0)
+
+ struct point {
+ GLfloat x;
+ GLfloat y;
+ };
+
+ /* Create the 7 points (only x,y coords) used to draw a tooth */
+ struct point p[7] = {
+ GEAR_POINT(r2, 1), // 0
+ GEAR_POINT(r2, 2), // 1
+ GEAR_POINT(r1, 0), // 2
+ GEAR_POINT(r1, 3), // 3
+ GEAR_POINT(r0, 0), // 4
+ GEAR_POINT(r1, 4), // 5
+ GEAR_POINT(r0, 4), // 6
+ };
+
+ /* Front face */
+ START_STRIP;
+ SET_NORMAL(0, 0, 1.0);
+ v = GEAR_VERT(v, 0, +1);
+ v = GEAR_VERT(v, 1, +1);
+ v = GEAR_VERT(v, 2, +1);
+ v = GEAR_VERT(v, 3, +1);
+ v = GEAR_VERT(v, 4, +1);
+ v = GEAR_VERT(v, 5, +1);
+ v = GEAR_VERT(v, 6, +1);
+ END_STRIP;
+
+ /* Inner face */
+ START_STRIP;
+ QUAD_WITH_NORMAL(4, 6);
+ END_STRIP;
+
+ /* Back face */
+ START_STRIP;
+ SET_NORMAL(0, 0, -1.0);
+ v = GEAR_VERT(v, 6, -1);
+ v = GEAR_VERT(v, 5, -1);
+ v = GEAR_VERT(v, 4, -1);
+ v = GEAR_VERT(v, 3, -1);
+ v = GEAR_VERT(v, 2, -1);
+ v = GEAR_VERT(v, 1, -1);
+ v = GEAR_VERT(v, 0, -1);
+ END_STRIP;
+
+ /* Outer face */
+ START_STRIP;
+ QUAD_WITH_NORMAL(0, 2);
+ END_STRIP;
+
+ START_STRIP;
+ QUAD_WITH_NORMAL(1, 0);
+ END_STRIP;
+
+ START_STRIP;
+ QUAD_WITH_NORMAL(3, 1);
+ END_STRIP;
+
+ START_STRIP;
+ QUAD_WITH_NORMAL(5, 3);
+ END_STRIP;
+ }
+
+ gear->nvertices = (v - gear->vertices);
+
+ /* Store the vertices in a vertex buffer object (VBO) */
+ glGenBuffers(1, &gear->vbo);
+ glBindBuffer(GL_ARRAY_BUFFER, gear->vbo);
+ glBufferData(GL_ARRAY_BUFFER, gear->nvertices * sizeof(GearVertex),
+ gear->vertices, GL_STATIC_DRAW);
+
+ return gear;
+}
+
+/**
+ * Multiplies two 4x4 matrices.
+ *
+ * The result is stored in matrix m.
+ *
+ * @param m the first matrix to multiply
+ * @param n the second matrix to multiply
+ */
+static void
+multiply(GLfloat *m, const GLfloat *n)
+{
+ GLfloat tmp[16];
+ const GLfloat *row, *column;
+ div_t d;
+ int i, j;
+
+ for (i = 0; i < 16; i++) {
+ tmp[i] = 0;
+ d = div(i, 4);
+ row = n + d.quot * 4;
+ column = m + d.rem;
+ for (j = 0; j < 4; j++)
+ tmp[i] += row[j] * column[j * 4];
+ }
+ memcpy(m, &tmp, sizeof tmp);
+}
+
+/**
+ * Rotates a 4x4 matrix.
+ *
+ * @param[in,out] m the matrix to rotate
+ * @param angle the angle to rotate
+ * @param x the x component of the direction to rotate to
+ * @param y the y component of the direction to rotate to
+ * @param z the z component of the direction to rotate to
+ */
+static void
+rotate(GLfloat *m, GLfloat angle, GLfloat x, GLfloat y, GLfloat z)
+{
+ double s, c;
+
+ sincos(angle, &s, &c);
+ GLfloat r[16] = {
+ x * x * (1 - c) + c, y * x * (1 - c) + z * s, x * z * (1 - c) - y * s, 0,
+ x * y * (1 - c) - z * s, y * y * (1 - c) + c, y * z * (1 - c) + x * s, 0,
+ x * z * (1 - c) + y * s, y * z * (1 - c) - x * s, z * z * (1 - c) + c, 0,
+ 0, 0, 0, 1
+ };
+
+ multiply(m, r);
+}
+
+
+/**
+ * Translates a 4x4 matrix.
+ *
+ * @param[in,out] m the matrix to translate
+ * @param x the x component of the direction to translate to
+ * @param y the y component of the direction to translate to
+ * @param z the z component of the direction to translate to
+ */
+static void
+translate(GLfloat *m, GLfloat x, GLfloat y, GLfloat z)
+{
+ GLfloat t[16] = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1 };
+
+ multiply(m, t);
+}
+
+/**
+ * Creates an identity 4x4 matrix.
+ *
+ * @param m the matrix make an identity matrix
+ */
+static void
+identity(GLfloat *m)
+{
+ GLfloat t[16] = {
+ 1.0, 0.0, 0.0, 0.0,
+ 0.0, 1.0, 0.0, 0.0,
+ 0.0, 0.0, 1.0, 0.0,
+ 0.0, 0.0, 0.0, 1.0,
+ };
+
+ memcpy(m, t, sizeof(t));
+}
+
+/**
+ * Transposes a 4x4 matrix.
+ *
+ * @param m the matrix to transpose
+ */
+static void
+transpose(GLfloat *m)
+{
+ GLfloat t[16] = {
+ m[0], m[4], m[8], m[12],
+ m[1], m[5], m[9], m[13],
+ m[2], m[6], m[10], m[14],
+ m[3], m[7], m[11], m[15]};
+
+ memcpy(m, t, sizeof(t));
+}
+
+/**
+ * Inverts a 4x4 matrix.
+ *
+ * This function can currently handle only pure translation-rotation matrices.
+ * Read http://www.gamedev.net/community/forums/topic.asp?topic_id=425118
+ * for an explanation.
+ */
+static void
+invert(GLfloat *m)
+{
+ GLfloat t[16];
+ identity(t);
+
+ // Extract and invert the translation part 't'. The inverse of a
+ // translation matrix can be calculated by negating the translation
+ // coordinates.
+ t[12] = -m[12]; t[13] = -m[13]; t[14] = -m[14];
+
+ // Invert the rotation part 'r'. The inverse of a rotation matrix is
+ // equal to its transpose.
+ m[12] = m[13] = m[14] = 0;
+ transpose(m);
+
+ // inv(m) = inv(r) * inv(t)
+ multiply(m, t);
+}
+
+/**
+ * Calculate a perspective projection transformation.
+ *
+ * @param m the matrix to save the transformation in
+ * @param fovy the field of view in the y direction
+ * @param aspect the view aspect ratio
+ * @param zNear the near clipping plane
+ * @param zFar the far clipping plane
+ */
+void perspective(GLfloat *m, GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
+{
+ GLfloat tmp[16];
+ identity(tmp);
+
+ double sine, cosine, cotangent, deltaZ;
+ GLfloat radians = fovy / 2 * M_PI / 180;
+
+ deltaZ = zFar - zNear;
+ sincos(radians, &sine, &cosine);
+
+ if ((deltaZ == 0) || (sine == 0) || (aspect == 0))
+ return;
+
+ cotangent = cosine / sine;
+
+ tmp[0] = cotangent / aspect;
+ tmp[5] = cotangent;
+ tmp[10] = -(zFar + zNear) / deltaZ;
+ tmp[11] = -1;
+ tmp[14] = -2 * zNear * zFar / deltaZ;
+ tmp[15] = 0;
+
+ memcpy(m, tmp, sizeof(tmp));
+}
+
+/**
+ * Draws a gear.
+ *
+ * @param gear the gear to draw
+ * @param transform the current transformation matrix
+ * @param x the x position to draw the gear at
+ * @param y the y position to draw the gear at
+ * @param angle the rotation angle of the gear
+ * @param color the color of the gear
+ */
+static void
+draw_gear(struct gear *gear, GLfloat *transform,
+ GLfloat x, GLfloat y, GLfloat angle, const GLfloat color[4])
+{
+ GLfloat model_view[16];
+ GLfloat normal_matrix[16];
+ GLfloat model_view_projection[16];
+
+ /* Translate and rotate the gear */
+ memcpy(model_view, transform, sizeof (model_view));
+ translate(model_view, x, y, 0);
+ rotate(model_view, 2 * M_PI * angle / 360.0, 0, 0, 1);
+
+ /* Create and set the ModelViewProjectionMatrix */
+ memcpy(model_view_projection, ProjectionMatrix, sizeof(model_view_projection));
+ multiply(model_view_projection, model_view);
+
+ glUniformMatrix4fv(ModelViewProjectionMatrix_location, 1, GL_FALSE,
+ model_view_projection);
+
+ /*
+ * Create and set the NormalMatrix. It's the inverse transpose of the
+ * ModelView matrix.
+ */
+ memcpy(normal_matrix, model_view, sizeof (normal_matrix));
+ invert(normal_matrix);
+ transpose(normal_matrix);
+ glUniformMatrix4fv(NormalMatrix_location, 1, GL_FALSE, normal_matrix);
+
+ /* Set the gear color */
+ glUniform4fv(MaterialColor_location, 1, color);
+
+ /* Set the vertex buffer object to use */
+ glBindBuffer(GL_ARRAY_BUFFER, gear->vbo);
+
+ /* Set up the position of the attributes in the vertex buffer object */
+ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,
+ 6 * sizeof(GLfloat), NULL);
+ glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,
+ 6 * sizeof(GLfloat), (GLfloat *) 0 + 3);
+
+ /* Enable the attributes */
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+
+ /* Draw the triangle strips that comprise the gear */
+ int n;
+ for (n = 0; n < gear->nstrips; n++)
+ glDrawArrays(GL_TRIANGLE_STRIP, gear->strips[n].first, gear->strips[n].count);
+
+ /* Disable the attributes */
+ glDisableVertexAttribArray(1);
+ glDisableVertexAttribArray(0);
+}
+
+/**
+ * Draws the gears.
+ */
+static void
+gears_draw(void)
+{
+ const static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
+ const static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
+ const static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
+ GLfloat transform[16];
+ identity(transform);
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ /* Translate and rotate the view */
+ translate(transform, 0, 0, -20);
+ rotate(transform, 2 * M_PI * view_rot[0] / 360.0, 1, 0, 0);
+ rotate(transform, 2 * M_PI * view_rot[1] / 360.0, 0, 1, 0);
+ rotate(transform, 2 * M_PI * view_rot[2] / 360.0, 0, 0, 1);
+
+ /* Draw the gears */
+ draw_gear(gear1, transform, -3.0, -2.0, angle, red);
+ draw_gear(gear2, transform, 3.1, -2.0, -2 * angle - 9.0, green);
+ draw_gear(gear3, transform, -3.1, 4.2, -2 * angle - 25.0, blue);
+
+ glutSwapBuffers();
+}
+
+/**
+ * Handles a new window size or exposure.
+ *
+ * @param width the window width
+ * @param height the window height
+ */
+static void
+gears_reshape(int width, int height)
+{
+ /* Update the projection matrix */
+ perspective(ProjectionMatrix, 60.0, width / (float)height, 1.0, 1024.0);
+
+ /* Set the viewport */
+ glViewport(0, 0, (GLint) width, (GLint) height);
+}
+
+/**
+ * Handles special glut events.
+ *
+ * @param special the event to handle.
+ */
+static void
+gears_special(int special, int crap, int morecrap)
+{
+ switch (special) {
+ case GLUT_KEY_LEFT:
+ view_rot[1] += 5.0;
+ break;
+ case GLUT_KEY_RIGHT:
+ view_rot[1] -= 5.0;
+ break;
+ case GLUT_KEY_UP:
+ view_rot[0] += 5.0;
+ break;
+ case GLUT_KEY_DOWN:
+ view_rot[0] -= 5.0;
+ break;
+ }
+}
+
+static void
+gears_idle(void)
+{
+ static int frames = 0;
+ static double tRot0 = -1.0, tRate0 = -1.0;
+ double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+
+ if (tRot0 < 0.0)
+ tRot0 = t;
+ dt = t - tRot0;
+ tRot0 = t;
+
+ /* advance rotation for next frame */
+ angle += 70.0 * dt; /* 70 degrees per second */
+ if (angle > 3600.0)
+ angle -= 3600.0;
+
+ glutPostRedisplay();
+ frames++;
+
+ if (tRate0 < 0.0)
+ tRate0 = t;
+ if (t - tRate0 >= 5.0) {
+ GLfloat seconds = t - tRate0;
+ GLfloat fps = frames / seconds;
+ printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
+ fps);
+ tRate0 = t;
+ frames = 0;
+ }
+}
+
+static const char vertex_shader[] =
+"attribute vec3 position;\n"
+"attribute vec3 normal;\n"
+"\n"
+"uniform mat4 ModelViewProjectionMatrix;\n"
+"uniform mat4 NormalMatrix;\n"
+"uniform vec4 LightSourcePosition;\n"
+"uniform vec4 MaterialColor;\n"
+"\n"
+"varying vec4 Color;\n"
+"\n"
+"void main(void)\n"
+"{\n"
+" // Transform the normal to eye coordinates\n"
+" vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));\n"
+"\n"
+" // The LightSourcePosition is actually its direction for directional light\n"
+" vec3 L = normalize(LightSourcePosition.xyz);\n"
+"\n"
+" // Multiply the diffuse value by the vertex color (which is fixed in this case)\n"
+" // to get the actual color that we will use to draw this vertex with\n"
+" float diffuse = max(dot(N, L), 0.0);\n"
+" Color = diffuse * MaterialColor;\n"
+"\n"
+" // Transform the position to clip coordinates\n"
+" gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);\n"
+"}";
+
+static const char fragment_shader[] =
+"#ifdef GL_ES\n"
+"precision mediump float;\n"
+"#endif\n"
+"varying vec4 Color;\n"
+"\n"
+"void main(void)\n"
+"{\n"
+" vec2 d = dFdx(Color.xy);\n"
+" gl_FragColor = Color;\n"
+"}";
+
+static void
+gears_init(void)
+{
+ GLuint v, f, program;
+ const char *p;
+ char msg[512];
+
+ glEnable(GL_CULL_FACE);
+ glEnable(GL_DEPTH_TEST);
+
+ /* Compile the vertex shader */
+ p = vertex_shader;
+ v = glCreateShader(GL_VERTEX_SHADER);
+ glShaderSource(v, 1, &p, NULL);