+++ /dev/null
-/*
- * Use GL_ARB_fragment_program and GL_ARB_vertex_program to implement
- * simple per-pixel lighting.
- *
- * Brian Paul
- * 17 April 2003
- */
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glut.h>
-
-
-static GLfloat Diffuse[4] = { 0.5, 0.5, 1.0, 1.0 };
-static GLfloat Specular[4] = { 0.8, 0.8, 0.8, 1.0 };
-static GLfloat LightPos[4] = { 0.0, 10.0, 20.0, 1.0 };
-static GLfloat Delta = 1.0;
-
-static GLuint FragProg;
-static GLuint VertProg;
-static GLboolean Anim = GL_TRUE;
-static GLboolean Wire = GL_FALSE;
-static GLboolean PixelLight = GL_TRUE;
-static GLint Win;
-
-static GLint T0 = 0;
-static GLint Frames = 0;
-
-static GLfloat Xrot = 0, Yrot = 0;
-
-static PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB_func;
-static PFNGLPROGRAMLOCALPARAMETER4DARBPROC glProgramLocalParameter4dARB_func;
-static PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC glGetProgramLocalParameterdvARB_func;
-static PFNGLGENPROGRAMSARBPROC glGenProgramsARB_func;
-static PFNGLPROGRAMSTRINGARBPROC glProgramStringARB_func;
-static PFNGLBINDPROGRAMARBPROC glBindProgramARB_func;
-static PFNGLISPROGRAMARBPROC glIsProgramARB_func;
-static PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB_func;
-
-/* These must match the indexes used in the fragment program */
-#define LIGHTPOS 3
-
-/* Set to one to test ARB_fog_linear program option */
-#define DO_FRAGMENT_FOG 0
-
-static void normalize (GLfloat *dst, const GLfloat *src)
-{
- GLfloat len = sqrt (src[0] * src[0] + src[1] * src[1] + src[2] * src[2]);
- dst[0] = src[0] / len;
- dst[1] = src[1] / len;
- dst[2] = src[2] / len;
-}
-
-static void Redisplay( void )
-{
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- if (PixelLight) {
- GLfloat pos[4];
-
- normalize( pos, LightPos );
- pos[3] = LightPos[3];
- glProgramLocalParameter4fvARB_func(GL_FRAGMENT_PROGRAM_ARB,
- LIGHTPOS, pos);
- glEnable(GL_FRAGMENT_PROGRAM_ARB);
- glEnable(GL_VERTEX_PROGRAM_ARB);
- glDisable(GL_LIGHTING);
- }
- else {
- glLightfv(GL_LIGHT0, GL_POSITION, LightPos);
- glDisable(GL_FRAGMENT_PROGRAM_ARB);
- glDisable(GL_VERTEX_PROGRAM_ARB);
- glEnable(GL_LIGHTING);
- }
-
- glPushMatrix();
- glRotatef(Xrot, 1, 0, 0);
- glRotatef(Yrot, 0, 1, 0);
- glutSolidSphere(2.0, 10, 5);
- glPopMatrix();
-
- glutSwapBuffers();
-
- Frames++;
-
- if (Anim) {
- GLint t = glutGet(GLUT_ELAPSED_TIME);
- if (t - T0 >= 5000) {
- GLfloat seconds = (t - T0) / 1000.0;
- GLfloat fps = Frames / seconds;
- printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
- fflush(stdout);
- T0 = t;
- Frames = 0;
- }
- }
-}
-
-
-static void Idle(void)
-{
- LightPos[0] += Delta;
- if (LightPos[0] > 25.0)
- Delta = -1.0;
- else if (LightPos[0] <- 25.0)
- Delta = 1.0;
- glutPostRedisplay();
-}
-
-
-static void Reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
- glTranslatef( 0.0, 0.0, -15.0 );
-}
-
-
-static void Key( unsigned char key, int x, int y )
-{
- (void) x;
- (void) y;
- switch (key) {
- case ' ':
- case 'a':
- Anim = !Anim;
- if (Anim)
- glutIdleFunc(Idle);
- else
- glutIdleFunc(NULL);
- break;
- case 'x':
- LightPos[0] -= 1.0;
- break;
- case 'X':
- LightPos[0] += 1.0;
- break;
- case 'w':
- Wire = !Wire;
- if (Wire)
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- else
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- break;
- case 'p':
- PixelLight = !PixelLight;
- if (PixelLight) {
- printf("Per-pixel lighting\n");
- }
- else {
- printf("Conventional lighting\n");
- }
- break;
- case 27:
- glDeleteProgramsARB_func(1, &VertProg);
- glDeleteProgramsARB_func(1, &FragProg);
- glutDestroyWindow(Win);
- exit(0);
- break;
- }
- glutPostRedisplay();
-}
-
-static void SpecialKey( int key, int x, int y )
-{
- const GLfloat step = 3.0;
- (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();
-}
-
-
-/* A helper for finding errors in program strings */
-static int FindLine( const char *program, int position )
-{
- int i, line = 1;
- for (i = 0; i < position; i++) {
- if (program[i] == '\n')
- line++;
- }
- return line;
-}
-
-
-static void Init( void )
-{
- GLint errorPos;
-
- /* Yes, this could be expressed more efficiently */
- static const char *fragProgramText =
- "!!ARBfp1.0\n"
-#if DO_FRAGMENT_FOG
- "OPTION ARB_fog_linear; \n"
-#endif
- "PARAM Diffuse = state.material.diffuse; \n"
- "PARAM Specular = state.material.specular; \n"
- "PARAM LightPos = program.local[3]; \n"
- "TEMP normal, len; \n"
- "TEMP dotProd, specAtten; \n"
- "TEMP diffuseColor, specularColor; \n"
-
- "# Compute normalized normal \n"
- "DP3 len.x, fragment.texcoord[0], fragment.texcoord[0]; \n"
- "RSQ len.y, len.x; \n"
- "MUL normal.xyz, fragment.texcoord[0], len.y; \n"
-
- "# Compute dot product of light direction and normal vector\n"
- "DP3_SAT dotProd.x, LightPos, normal; # limited to [0,1]\n"
-
- "MUL diffuseColor.xyz, Diffuse, dotProd.x; # diffuse attenuation\n"
-
- "POW specAtten.x, dotProd.x, {20.0}.x; # specular exponent\n"
-
- "MUL specularColor.xyz, Specular, specAtten.x; # specular attenuation\n"
-
- "MOV result.color.w, Diffuse; \n"
-#if DO_FRAGMENT_FOG
- "# need to clamp color to [0,1] before fogging \n"
- "ADD_SAT result.color.xyz, diffuseColor, specularColor; # add colors\n"
-#else
- "# clamping will be done after program's finished \n"
- "ADD result.color.xyz, diffuseColor, specularColor; # add colors\n"
-#endif
- "END \n"
- ;
-
- static const char *vertProgramText =
- "!!ARBvp1.0\n"
- "ATTRIB pos = vertex.position; \n"
- "ATTRIB norm = vertex.normal; \n"
- "PARAM modelview[4] = { state.matrix.modelview }; \n"
- "PARAM modelviewProj[4] = { state.matrix.mvp }; \n"
- "PARAM invModelview[4] = { state.matrix.modelview.invtrans }; \n"
-
- "# typical modelview/projection transform \n"
- "DP4 result.position.x, pos, modelviewProj[0]; \n"
- "DP4 result.position.y, pos, modelviewProj[1]; \n"
- "DP4 result.position.z, pos, modelviewProj[2]; \n"
- "DP4 result.position.w, pos, modelviewProj[3]; \n"
-
- "# transform normal by inv transpose of modelview, put in tex0 \n"
- "DP3 result.texcoord[0].x, norm, invModelview[0]; \n"
- "DP3 result.texcoord[0].y, norm, invModelview[1]; \n"
- "DP3 result.texcoord[0].z, norm, invModelview[2]; \n"
- "DP3 result.texcoord[0].w, norm, invModelview[3]; \n"
-
-#if DO_FRAGMENT_FOG
- "# compute fog coordinate = vertex eye-space Z coord (negated)\n"
- "DP4 result.fogcoord, -pos, modelview[2]; \n"
-#endif
- "END\n";
- ;
-
- if (!glutExtensionSupported("GL_ARB_vertex_program")) {
- printf("Sorry, this demo requires GL_ARB_vertex_program\n");
- exit(1);
- }
- if (!glutExtensionSupported("GL_ARB_fragment_program")) {
- printf("Sorry, this demo requires GL_ARB_fragment_program\n");
- exit(1);
- }
-
- /*
- * Get extension function pointers.
- */
- glProgramLocalParameter4fvARB_func = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC) glutGetProcAddress("glProgramLocalParameter4fvARB");
- assert(glProgramLocalParameter4fvARB_func);
-
- glProgramLocalParameter4dARB_func = (PFNGLPROGRAMLOCALPARAMETER4DARBPROC) glutGetProcAddress("glProgramLocalParameter4dARB");
- assert(glProgramLocalParameter4dARB_func);
-
- glGetProgramLocalParameterdvARB_func = (PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC) glutGetProcAddress("glGetProgramLocalParameterdvARB");
- assert(glGetProgramLocalParameterdvARB_func);
-
- glGenProgramsARB_func = (PFNGLGENPROGRAMSARBPROC) glutGetProcAddress("glGenProgramsARB");
- assert(glGenProgramsARB_func);
-
- glProgramStringARB_func = (PFNGLPROGRAMSTRINGARBPROC) glutGetProcAddress("glProgramStringARB");
- assert(glProgramStringARB_func);
-
- glBindProgramARB_func = (PFNGLBINDPROGRAMARBPROC) glutGetProcAddress("glBindProgramARB");
- assert(glBindProgramARB_func);
-
- glIsProgramARB_func = (PFNGLISPROGRAMARBPROC) glutGetProcAddress("glIsProgramARB");
- assert(glIsProgramARB_func);
-
- glDeleteProgramsARB_func = (PFNGLDELETEPROGRAMSARBPROC) glutGetProcAddress("glDeleteProgramsARB");
- assert(glDeleteProgramsARB_func);
-
- /*
- * Fragment program
- */
- glGenProgramsARB_func(1, &FragProg);
- assert(FragProg > 0);
- glBindProgramARB_func(GL_FRAGMENT_PROGRAM_ARB, FragProg);
- glProgramStringARB_func(GL_FRAGMENT_PROGRAM_ARB,
- GL_PROGRAM_FORMAT_ASCII_ARB,
- strlen(fragProgramText),
- (const GLubyte *) fragProgramText);
- glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
- if (glGetError() != GL_NO_ERROR || errorPos != -1) {
- int l = FindLine(fragProgramText, errorPos);
- printf("Fragment Program Error (pos=%d line=%d): %s\n", errorPos, l,
- (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
- exit(0);
- }
- assert(glIsProgramARB_func(FragProg));
-
- /*
- * Do some sanity tests
- */
- {
- GLdouble v[4];
- glProgramLocalParameter4dARB_func(GL_FRAGMENT_PROGRAM_ARB, 8,
- 10.0, 20.0, 30.0, 40.0);
- glGetProgramLocalParameterdvARB_func(GL_FRAGMENT_PROGRAM_ARB, 8, v);
- assert(v[0] == 10.0);
- assert(v[1] == 20.0);
- assert(v[2] == 30.0);
- assert(v[3] == 40.0);
- }
-
- /*
- * Vertex program
- */
- glGenProgramsARB_func(1, &VertProg);
- assert(VertProg > 0);
- glBindProgramARB_func(GL_VERTEX_PROGRAM_ARB, VertProg);
- glProgramStringARB_func(GL_VERTEX_PROGRAM_ARB,
- GL_PROGRAM_FORMAT_ASCII_ARB,
- strlen(vertProgramText),
- (const GLubyte *) vertProgramText);
- glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
- if (glGetError() != GL_NO_ERROR || errorPos != -1) {
- int l = FindLine(vertProgramText, errorPos);
- printf("Vertex Program Error (pos=%d line=%d): %s\n", errorPos, l,
- (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
- exit(0);
- }
- assert(glIsProgramARB_func(VertProg));
-
- /*
- * Misc init
- */
- glClearColor(0.3, 0.3, 0.3, 0.0);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHT0);
- glEnable(GL_LIGHTING);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, Diffuse);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, Specular);
- glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 20.0);
-
-#if DO_FRAGMENT_FOG
- {
- /* Green-ish fog color */
- static const GLfloat fogColor[4] = {0.5, 1.0, 0.5, 0};
- glFogfv(GL_FOG_COLOR, fogColor);
- glFogf(GL_FOG_START, 5.0);
- glFogf(GL_FOG_END, 25.0);
- }
-#endif
-
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
- printf("Press p to toggle between per-pixel and per-vertex lighting\n");
-}
-
-
-int main( int argc, char *argv[] )
-{
- glutInitWindowSize( 200, 200 );
- glutInit( &argc, argv );
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
- Win = glutCreateWindow(argv[0]);
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
- glutDisplayFunc( Redisplay );
- if (Anim)
- glutIdleFunc(Idle);
- Init();
- glutMainLoop();
- return 0;
-}
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