diff options
Diffstat (limited to 'progs/glsl/twoside.c')
-rw-r--r-- | progs/glsl/twoside.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/progs/glsl/twoside.c b/progs/glsl/twoside.c deleted file mode 100644 index ce155d64e9..0000000000 --- a/progs/glsl/twoside.c +++ /dev/null @@ -1,305 +0,0 @@ -/** - * Test two-sided lighting with shaders. - * Both GL_VERTEX_PROGRAM_TWO_SIDE and gl_FrontFacing can be tested - * (see keys below). - * - * Brian Paul - * 18 Dec 2007 - */ - -#include <assert.h> -#include <string.h> -#include <stdio.h> -#include <stdlib.h> -#include <math.h> -#include <GL/glew.h> -#include <GL/glut.h> -#include "shaderutil.h" - -#ifndef M_PI -#define M_PI 3.1415926535 -#endif - -static GLint WinWidth = 300, WinHeight = 300; -static char *FragProgFile = NULL; -static char *VertProgFile = NULL; -static GLuint fragShader; -static GLuint vertShader; -static GLuint program; -static GLint win = 0; -static GLboolean anim; -static GLboolean DetermineFacingInFragProg; -static GLfloat Xrot; -static GLint u_fragface; -static GLenum FrontWinding; -static int prevTime = 0; - - -static const GLfloat Red[4] = {1, 0, 0, 1}; -static const GLfloat Green[4] = {0, 1, 0, 0}; - - -static void -SetDefaults(void) -{ - DetermineFacingInFragProg = GL_TRUE; - FrontWinding = GL_CCW; - Xrot = 30; - anim = 0; - glutIdleFunc(NULL); -} - - -static void -Redisplay(void) -{ - const int sections = 20; - int i; - float radius = 2; - - glFrontFace(FrontWinding); - - if (DetermineFacingInFragProg) { - glUniform1i(u_fragface, 1); - glDisable(GL_VERTEX_PROGRAM_TWO_SIDE); - } - else { - glUniform1i(u_fragface, 0); - glEnable(GL_VERTEX_PROGRAM_TWO_SIDE); - } - - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); - - glPushMatrix(); - glRotatef(Xrot, 1, 0, 0); - - /* Draw a tristrip ring */ - glBegin(GL_TRIANGLE_STRIP); - glColor4fv(Red); - glSecondaryColor3fv(Green); - for (i = 0; i <= sections; i++) { - float a = (float) i / (sections) * M_PI * 2.0; - float x = radius * cos(a); - float y = radius * sin(a); - glVertex3f(x, -1, y); - glVertex3f(x, +1, y); - } - glEnd(); - - glPopMatrix(); - - glutSwapBuffers(); -} - - -static void -Idle(void) -{ - int curTime = glutGet(GLUT_ELAPSED_TIME); - int dt = curTime - prevTime; - - if (prevTime == 0) { - prevTime = curTime; - return; - } - prevTime = curTime; - - Xrot += dt * 0.1; - glutPostRedisplay(); -} - - -static void -Reshape(int width, int height) -{ - float ar = (float) width / height; - glViewport(0, 0, width, height); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glFrustum(-ar, ar, -1, 1, 3, 25); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - glTranslatef(0, 0, -10); -} - - -static void -CleanUp(void) -{ - glDeleteShader(fragShader); - glDeleteShader(vertShader); - glDeleteProgram(program); - glutDestroyWindow(win); -} - - -static void -Key(unsigned char key, int x, int y) -{ - (void) x; - (void) y; - - switch(key) { - case ' ': - case 'a': - anim = !anim; - if (anim) { - prevTime = glutGet(GLUT_ELAPSED_TIME); - glutIdleFunc(Idle); - } - else - glutIdleFunc(NULL); - break; - case 'f': - printf("Using frag shader gl_FrontFacing\n"); - DetermineFacingInFragProg = GL_TRUE; - break; - case 'v': - printf("Using vert shader Two-sided lighting\n"); - DetermineFacingInFragProg = GL_FALSE; - break; - case 'r': - /* reset */ - SetDefaults(); - break; - case 's': - Xrot += 5; - break; - case 'S': - Xrot -= 5; - break; - case 'w': - if (FrontWinding == GL_CCW) { - FrontWinding = GL_CW; - printf("FrontFace = GL_CW\n"); - } - else { - FrontWinding = GL_CCW; - printf("FrontFace = GL_CCW\n"); - } - break; - case 27: - CleanUp(); - exit(0); - break; - } - glutPostRedisplay(); -} - - -static void -Init(void) -{ - static const char *fragShaderText = - "uniform bool fragface; \n" - "void main() { \n" -#if 1 - " if (!fragface || gl_FrontFacing) { \n" - " gl_FragColor = gl_Color; \n" - " } \n" - " else { \n" - " // note: dim green to help debug \n" - " gl_FragColor = 0.8 * gl_SecondaryColor; \n" - " } \n" -#else - /* DEBUG CODE */ - " bool f = gl_FrontFacing; \n" - " if (f) { \n" - " gl_FragColor = vec4(1.0, 0.0, 0.0, 0.0); \n" - " } \n" - " else { \n" - " gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0); \n" - " } \n" -#endif - "} \n"; - static const char *vertShaderText = - "uniform bool fragface; \n" - "void main() { \n" - " gl_FrontColor = gl_Color; \n" - " if (fragface) { \n" - " // front/back chosen in frag prog \n" - " gl_FrontSecondaryColor = gl_SecondaryColor; \n" - " } \n" - " else { \n" - " // front/back chosen in prim setup \n" - " gl_BackColor = gl_SecondaryColor; \n" - " } \n" - " gl_Position = ftransform(); \n" - "} \n"; - - if (!ShadersSupported()) - exit(1); - - vertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText); - fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText); - program = LinkShaders(vertShader, fragShader); - - glUseProgram(program); - - u_fragface = glGetUniformLocation(program, "fragface"); - printf("Uniforms: %d\n", u_fragface); - - /*assert(glGetError() == 0);*/ - - glClearColor(0.3f, 0.3f, 0.3f, 0.0f); - - printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); - - assert(glIsProgram(program)); - assert(glIsShader(fragShader)); - assert(glIsShader(vertShader)); - - glEnable(GL_DEPTH_TEST); - - SetDefaults(); -} - - -static void -ParseOptions(int argc, char *argv[]) -{ - int i; - for (i = 1; i < argc; i++) { - if (strcmp(argv[i], "-fs") == 0) { - FragProgFile = argv[i+1]; - } - else if (strcmp(argv[i], "-vs") == 0) { - VertProgFile = argv[i+1]; - } - } -} - - -static void -Usage(void) -{ - printf("Keys:\n"); - printf(" f - do front/back determination in fragment shader\n"); - printf(" v - do front/back determination in vertex shader\n"); - printf(" r - reset, show front\n"); - printf(" a - toggle animation\n"); - printf(" s - step rotation\n"); - printf(" w - toggle CW, CCW front-face winding\n"); - printf("NOTE: red = front face, green = back face.\n"); -} - - -int -main(int argc, char *argv[]) -{ - glutInit(&argc, argv); - glutInitWindowSize(WinWidth, WinHeight); - glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); - win = glutCreateWindow(argv[0]); - glewInit(); - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Redisplay); - if (anim) - glutIdleFunc(Idle); - ParseOptions(argc, argv); - Init(); - Usage(); - glutMainLoop(); - return 0; -} |