--- /dev/null
+/**
+ * Test texturing with GL shading language.
+ *
+ * Copyright (C) 2007 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.
+ */
+
+
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "GL/glut.h"
+#include "readtex.h"
+#include "extfuncs.h"
+
+static const char *Demo = "texdemo1";
+
+static const char *ReflectVertFile = "reflect.vert.txt";
+static const char *CubeFragFile = "cubemap.frag.txt";
+
+static const char *SimpleVertFile = "simple.vert.txt";
+static const char *SimpleTexFragFile = "shadowtex.frag.txt";
+
+static const char *GroundImage = "../images/tile.rgb";
+
+static GLuint Program1, Program2;
+
+static GLfloat TexXrot = 0, TexYrot = 0;
+static GLfloat Xrot = 20.0, Yrot = 20.0, Zrot = 0.0;
+static GLfloat EyeDist = 10;
+static GLboolean Anim = GL_TRUE;
+
+
+struct uniform_info {
+ const char *name;
+ GLuint size;
+ GLint location;
+ GLenum type; /**< GL_FLOAT or GL_INT */
+ GLfloat value[4];
+};
+
+static struct uniform_info ReflectUniforms[] = {
+ { "cubeTex", 1, -1, GL_INT, { 0, 0, 0, 0 } },
+ { "lightPos", 3, -1, GL_FLOAT, { 10, 10, 20, 0 } },
+ { NULL, 0, 0, 0, { 0, 0, 0, 0 } }
+};
+
+static struct uniform_info SimpleUniforms[] = {
+ { "tex2d", 1, -1, GL_INT, { 1, 0, 0, 0 } },
+ { "lightPos", 3, -1, GL_FLOAT, { 10, 10, 20, 0 } },
+ { NULL, 0, 0, 0, { 0, 0, 0, 0 } }
+};
+
+
+static void
+CheckError(int line)
+{
+ GLenum err = glGetError();
+ if (err) {
+ printf("GL Error %s (0x%x) at line %d\n",
+ gluErrorString(err), (int) err, line);
+ }
+}
+
+
+static void
+DrawGround(GLfloat size)
+{
+ glPushMatrix();
+ glRotatef(90, 1, 0, 0);
+ glNormal3f(0, 0, 1);
+ glBegin(GL_POLYGON);
+ glTexCoord2f(-2, -2); glVertex2f(-size, -size);
+ glTexCoord2f( 2, -2); glVertex2f( size, -size);
+ glTexCoord2f( 2, 2); glVertex2f( size, size);
+ glTexCoord2f(-2, 2); glVertex2f(-size, size);
+ glEnd();
+ glPopMatrix();
+}
+
+
+static void
+draw(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ glEnable(GL_TEXTURE_2D);
+
+ glPushMatrix(); /* modelview matrix */
+ glTranslatef(0.0, 0.0, -EyeDist);
+ glRotatef(Xrot, 1, 0, 0);
+ glRotatef(Yrot, 0, 1, 0);
+ glRotatef(Zrot, 0, 0, 1);
+
+ /* sphere w/ reflection map */
+ glPushMatrix();
+ glTranslatef(0, 1, 0);
+ glUseProgram_func(Program1);
+
+ /* setup texture matrix */
+ glActiveTexture(GL_TEXTURE0);
+ glMatrixMode(GL_TEXTURE);
+ glLoadIdentity();
+ glRotatef(-TexYrot, 0, 1, 0);
+ glRotatef(-TexXrot, 1, 0, 0);
+
+ glEnable(GL_TEXTURE_GEN_S);
+ glEnable(GL_TEXTURE_GEN_T);
+ glEnable(GL_TEXTURE_GEN_R);
+ glutSolidSphere(2.0, 20, 20);
+
+ glLoadIdentity(); /* texture matrix */
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+
+ /* ground */
+ glUseProgram_func(Program2);
+ glTranslatef(0, -1.0, 0);
+ DrawGround(5);
+
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+static void
+idle(void)
+{
+ GLfloat t = 0.05 * glutGet(GLUT_ELAPSED_TIME);
+ TexYrot = t;
+ glutPostRedisplay();
+}
+
+
+static void
+key(unsigned char k, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (k) {
+ case ' ':
+ case 'a':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc(idle);
+ else
+ glutIdleFunc(NULL);
+ break;
+ case 'z':
+ EyeDist -= 0.5;
+ if (EyeDist < 6.0)
+ EyeDist = 6.0;
+ break;
+ case 'Z':
+ EyeDist += 0.5;
+ if (EyeDist > 90.0)
+ EyeDist = 90;
+ break;
+ case 27:
+ exit(0);
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+specialkey(int key, int x, int y)
+{
+ GLfloat step = 2.0;
+ (void) x;
+ (void) y;
+ switch (key) {
+ case GLUT_KEY_UP:
+ Xrot += step;
+ break;
+ case GLUT_KEY_DOWN:
+ Xrot -= step;
+ break;
+ case GLUT_KEY_LEFT:
+ Yrot -= step;
+ break;
+ case GLUT_KEY_RIGHT:
+ Yrot += step;
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+/* new window size or exposure */
+static void
+Reshape(int width, int height)
+{
+ GLfloat ar = (float) width / (float) height;
+ glViewport(0, 0, (GLint)width, (GLint)height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-2.0*ar, 2.0*ar, -2.0, 2.0, 4.0, 100.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+
+static void
+InitCheckers(void)
+{
+#define CUBE_TEX_SIZE 64
+ GLubyte image[CUBE_TEX_SIZE][CUBE_TEX_SIZE][3];
+ static const GLubyte colors[6][3] = {
+ { 255, 0, 0 }, /* face 0 - red */
+ { 0, 255, 255 }, /* face 1 - cyan */
+ { 0, 255, 0 }, /* face 2 - green */
+ { 255, 0, 255 }, /* face 3 - purple */
+ { 0, 0, 255 }, /* face 4 - blue */
+ { 255, 255, 0 } /* face 5 - yellow */
+ };
+ static const GLenum targets[6] = {
+ GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
+ GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
+ GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
+ GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
+ };
+
+ GLint i, j, f;
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ /* make colored checkerboard cube faces */
+ for (f = 0; f < 6; f++) {
+ for (i = 0; i < CUBE_TEX_SIZE; i++) {
+ for (j = 0; j < CUBE_TEX_SIZE; j++) {
+ if ((i/4 + j/4) & 1) {
+ image[i][j][0] = colors[f][0];
+ image[i][j][1] = colors[f][1];
+ image[i][j][2] = colors[f][2];
+ }
+ else {
+ image[i][j][0] = 255;
+ image[i][j][1] = 255;
+ image[i][j][2] = 255;
+ }
+ }
+ }
+
+ glTexImage2D(targets[f], 0, GL_RGB, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, image);
+ }
+}
+
+
+static void
+LoadFace(GLenum target, const char *filename,
+ GLboolean flipTB, GLboolean flipLR)
+{
+ GLint w, h;
+ GLenum format;
+ GLubyte *img = LoadRGBImage(filename, &w, &h, &format);
+ if (!img) {
+ printf("Error: couldn't load texture image %s\n", filename);
+ exit(1);
+ }
+ assert(format == GL_RGB);
+
+ /* <sigh> the way the texture cube mapping works, we have to flip
+ * images to make things look right.
+ */
+ if (flipTB) {
+ const int stride = 3 * w;
+ GLubyte temp[3*1024];
+ int i;
+ for (i = 0; i < h / 2; i++) {
+ memcpy(temp, img + i * stride, stride);
+ memcpy(img + i * stride, img + (h - i - 1) * stride, stride);
+ memcpy(img + (h - i - 1) * stride, temp, stride);
+ }
+ }
+ if (flipLR) {
+ const int stride = 3 * w;
+ GLubyte temp[3];
+ GLubyte *row;
+ int i, j;
+ for (i = 0; i < h; i++) {
+ row = img + i * stride;
+ for (j = 0; j < w / 2; j++) {
+ int k = w - j - 1;
+ temp[0] = row[j*3+0];
+ temp[1] = row[j*3+1];
+ temp[2] = row[j*3+2];
+ row[j*3+0] = row[k*3+0];
+ row[j*3+1] = row[k*3+1];
+ row[j*3+2] = row[k*3+2];
+ row[k*3+0] = temp[0];
+ row[k*3+1] = temp[1];
+ row[k*3+2] = temp[2];
+ }
+ }
+ }
+
+ gluBuild2DMipmaps(target, GL_RGB, w, h, format, GL_UNSIGNED_BYTE, img);
+ free(img);
+}
+
+
+static void
+LoadEnvmaps(void)
+{
+ LoadFace(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, "right.rgb", GL_TRUE, GL_FALSE);
+ LoadFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, "left.rgb", GL_TRUE, GL_FALSE);
+ LoadFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, "top.rgb", GL_FALSE, GL_TRUE);
+ LoadFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, "bottom.rgb", GL_FALSE, GL_TRUE);
+ LoadFace(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, "front.rgb", GL_TRUE, GL_FALSE);
+ LoadFace(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, "back.rgb", GL_TRUE, GL_FALSE);
+}
+
+
+static void
+InitTextures(GLboolean useImageFiles)
+{
+ GLenum filter;
+
+ /*
+ * Env map
+ */
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_CUBE_MAP, 1);
+ if (useImageFiles) {
+ LoadEnvmaps();
+ filter = GL_LINEAR;
+ }
+ else {
+ InitCheckers();
+ filter = GL_NEAREST;
+ }
+ glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, filter);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, filter);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ /*
+ * Ground texture
+ */
+ {
+ GLint imgWidth, imgHeight;
+ GLenum imgFormat;
+ GLubyte *image = NULL;
+
+ image = LoadRGBImage(GroundImage, &imgWidth, &imgHeight, &imgFormat);
+ if (!image) {
+ printf("Couldn't read %s\n", GroundImage);
+ exit(0);
+ }
+
+ glActiveTexture(GL_TEXTURE1);
+ glBindTexture(GL_TEXTURE_2D, 2);
+ gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imgWidth, imgHeight,
+ imgFormat, GL_UNSIGNED_BYTE, image);
+ free(image);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ }
+}
+
+
+static void
+LoadAndCompileShader(GLuint shader, const char *text)
+{
+ GLint stat;
+
+ glShaderSource_func(shader, 1, (const GLchar **) &text, NULL);
+
+ glCompileShader_func(shader);
+
+ glGetShaderiv_func(shader, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog_func(shader, 1000, &len, log);
+ fprintf(stderr, "%s: problem compiling shader: %s\n", Demo, log);
+ exit(1);
+ }
+ else {
+ printf("Shader compiled OK\n");
+ }
+}
+
+
+/**
+ * Read a shader from a file.
+ */
+static void
+ReadShader(GLuint shader, const char *filename)
+{
+ const int max = 100*1000;
+ int n;
+ char *buffer = (char*) malloc(max);
+ FILE *f = fopen(filename, "r");
+ if (!f) {
+ fprintf(stderr, "%s: Unable to open shader file %s\n", Demo, filename);
+ exit(1);
+ }
+
+ n = fread(buffer, 1, max, f);
+ printf("%s: read %d bytes from shader file %s\n", Demo, n, filename);
+ if (n > 0) {
+ buffer[n] = 0;
+ LoadAndCompileShader(shader, buffer);
+ }
+
+ fclose(f);
+ free(buffer);
+}
+
+
+static void
+CheckLink(GLuint prog)
+{
+ GLint stat;
+ glGetProgramiv_func(prog, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog_func(prog, 1000, &len, log);
+ fprintf(stderr, "Linker error:\n%s\n", log);
+ }
+ else {
+ fprintf(stderr, "Link success!\n");
+ }
+}
+
+
+static GLuint
+CreateProgram(const char *vertProgFile, const char *fragProgFile,
+ struct uniform_info *uniforms)
+{
+ GLuint fragShader = 0, vertShader = 0, program = 0;
+ GLint i;
+
+ program = glCreateProgram_func();
+ if (vertProgFile) {
+ vertShader = glCreateShader_func(GL_VERTEX_SHADER);
+ ReadShader(vertShader, vertProgFile);
+ glAttachShader_func(program, vertShader);
+ }
+
+ if (fragProgFile) {
+ fragShader = glCreateShader_func(GL_FRAGMENT_SHADER);
+ ReadShader(fragShader, fragProgFile);
+ glAttachShader_func(program, fragShader);
+ }
+
+ glLinkProgram_func(program);
+ CheckLink(program);
+
+ glUseProgram_func(program);
+
+ assert(glIsProgram_func(program));
+ assert(glIsShader_func(fragShader));
+ assert(glIsShader_func(vertShader));
+
+ CheckError(__LINE__);
+ for (i = 0; uniforms[i].name; i++) {
+ uniforms[i].location
+ = glGetUniformLocation_func(program, uniforms[i].name);
+ printf("Uniform %s location: %d\n", uniforms[i].name,
+ uniforms[i].location);
+
+ switch (uniforms[i].size) {
+ case 1:
+ if (uniforms[i].type == GL_INT)
+ glUniform1i_func(uniforms[i].location,
+ (GLint) uniforms[i].value[0]);
+ else
+ glUniform1fv_func(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case 2:
+ glUniform2fv_func(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case 3:
+ glUniform3fv_func(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case 4:
+ glUniform4fv_func(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ default:
+ abort();
+ }
+ }
+
+ CheckError(__LINE__);
+
+ return program;
+}
+
+
+static void
+InitPrograms(void)
+{
+ Program1 = CreateProgram(ReflectVertFile, CubeFragFile, ReflectUniforms);
+ Program2 = CreateProgram(SimpleVertFile, SimpleTexFragFile, SimpleUniforms);
+}
+
+
+static void
+Init(GLboolean useImageFiles)
+{
+ const char *version = (const char *) glGetString(GL_VERSION);
+
+ if (version[0] != '2' || version[1] != '.') {
+ printf("Warning: this program expects OpenGL 2.0\n");
+ /*exit(1);*/
+ }
+ printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
+
+ GetExtensionFuncs();
+
+ InitTextures(useImageFiles);
+ InitPrograms();
+
+ glEnable(GL_DEPTH_TEST);
+
+ glClearColor(.6, .6, .9, 0);
+ glColor3f(1.0, 1.0, 1.0);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ glutInit(&argc, argv);
+ glutInitWindowSize(500, 400);
+ glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
+ glutCreateWindow(Demo);
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(key);
+ glutSpecialFunc(specialkey);
+ glutDisplayFunc(draw);
+ if (Anim)
+ glutIdleFunc(idle);
+ if (argc > 1 && strcmp(argv[1] , "-i") == 0)
+ Init(1);
+ else
+ Init(0);
+ glutMainLoop();
+ return 0;
+}
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