+++ /dev/null
-/*
- * Use GL_NV_fragment_program to implement per-pixel lighting.
- *
- * Brian Paul
- * 7 April 2003
- */
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.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 GLfloat Xrot = 0, Yrot = 0;
-
-
-#define NAMED_PARAMETER4FV(prog, name, v) \
- glProgramNamedParameter4fvNV(prog, strlen(name), (const GLubyte *) name, v)
-
-
-static void Display( void )
-{
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-
- if (PixelLight) {
-#if defined(GL_NV_fragment_program)
- NAMED_PARAMETER4FV(FragProg, "LightPos", LightPos);
- glEnable(GL_FRAGMENT_PROGRAM_NV);
- glEnable(GL_VERTEX_PROGRAM_NV);
-#endif
- glDisable(GL_LIGHTING);
- }
- else {
- glLightfv(GL_LIGHT0, GL_POSITION, LightPos);
-#if defined(GL_NV_fragment_program)
- glDisable(GL_FRAGMENT_PROGRAM_NV);
- glDisable(GL_VERTEX_PROGRAM_NV);
-#endif
- glEnable(GL_LIGHTING);
- }
-
- glPushMatrix();
- glRotatef(Xrot, 1, 0, 0);
- glRotatef(Yrot, 0, 1, 0);
-
-#if 1
- glutSolidSphere(2.0, 10, 5);
-#else
- {
- GLUquadricObj *q = gluNewQuadric();
- gluQuadricNormals(q, GL_SMOOTH);
- gluQuadricTexture(q, GL_TRUE);
- glRotatef(90, 1, 0, 0);
- glTranslatef(0, 0, -1);
- gluCylinder(q, 1.0, 1.0, 2.0, 24, 1);
- gluDeleteQuadric(q);
- }
-#endif
-
- glPopMatrix();
-
- glutSwapBuffers();
-}
-
-
-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 );
- /*glOrtho( -2.0, 2.0, -2.0, 2.0, 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 ' ':
- 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:
- glutDestroyWindow(Win);
- exit(0);
- }
- 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();
-}
-
-
-static void Init( void )
-{
- static const char *fragProgramText =
- "!!FP1.0\n"
- "DECLARE Diffuse; \n"
- "DECLARE Specular; \n"
- "DECLARE LightPos; \n"
-
- "# Compute normalized LightPos, put it in R0\n"
- "DP3 R0.x, LightPos, LightPos;\n"
- "RSQ R0.y, R0.x;\n"
- "MUL R0, LightPos, R0.y;\n"
-
- "# Compute normalized normal, put it in R1\n"
- "DP3 R1, f[TEX0], f[TEX0]; \n"
- "RSQ R1.y, R1.x;\n"
- "MUL R1, f[TEX0], R1.y;\n"
-
- "# Compute dot product of light direction and normal vector\n"
- "DP3_SAT R2, R0, R1;"
-
- "MUL R3, Diffuse, R2; # diffuse attenuation\n"
-
- "POW R4, R2.x, {20.0}.x; # specular exponent\n"
-
- "MUL R5, Specular, R4; # specular attenuation\n"
-
- "ADD o[COLR], R3, R5; # add diffuse and specular colors\n"
- "END \n"
- ;
-
- static const char *vertProgramText =
- "!!VP1.0\n"
- "# typical modelview/projection transform\n"
- "DP4 o[HPOS].x, c[0], v[OPOS] ;\n"
- "DP4 o[HPOS].y, c[1], v[OPOS] ;\n"
- "DP4 o[HPOS].z, c[2], v[OPOS] ;\n"
- "DP4 o[HPOS].w, c[3], v[OPOS] ;\n"
- "# transform normal by inv transpose of modelview, put in tex0\n"
- "DP3 o[TEX0].x, c[4], v[NRML] ;\n"
- "DP3 o[TEX0].y, c[5], v[NRML] ;\n"
- "DP3 o[TEX0].z, c[6], v[NRML] ;\n"
- "DP3 o[TEX0].w, c[7], v[NRML] ;\n"
- "END\n";
- ;
-
- if (!glutExtensionSupported("GL_NV_vertex_program")) {
- printf("Sorry, this demo requires GL_NV_vertex_program\n");
- exit(1);
- }
- if (!glutExtensionSupported("GL_NV_fragment_program")) {
- printf("Sorry, this demo requires GL_NV_fragment_program\n");
- exit(1);
- }
-
-#if defined(GL_NV_fragment_program)
- glGenProgramsNV(1, &FragProg);
- assert(FragProg > 0);
- glGenProgramsNV(1, &VertProg);
- assert(VertProg > 0);
-
- /*
- * Fragment program
- */
- glLoadProgramNV(GL_FRAGMENT_PROGRAM_NV, FragProg,
- strlen(fragProgramText),
- (const GLubyte *) fragProgramText);
- assert(glIsProgramNV(FragProg));
- glBindProgramNV(GL_FRAGMENT_PROGRAM_NV, FragProg);
-
- NAMED_PARAMETER4FV(FragProg, "Diffuse", Diffuse);
- NAMED_PARAMETER4FV(FragProg, "Specular", Specular);
-
- /*
- * Vertex program
- */
- glLoadProgramNV(GL_VERTEX_PROGRAM_NV, VertProg,
- strlen(vertProgramText),
- (const GLubyte *) vertProgramText);
- assert(glIsProgramNV(VertProg));
- glBindProgramNV(GL_VERTEX_PROGRAM_NV, VertProg);
- glTrackMatrixNV(GL_VERTEX_PROGRAM_NV, 0, GL_MODELVIEW_PROJECTION_NV, GL_IDENTITY_NV);
- glTrackMatrixNV(GL_VERTEX_PROGRAM_NV, 4, GL_MODELVIEW, GL_INVERSE_TRANSPOSE_NV);
-#endif
-
- /*
- * 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);
-
- 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]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
- glutDisplayFunc( Display );
- if (Anim)
- glutIdleFunc(Idle);
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff