diff options
Diffstat (limited to 'progs/glsl/fragcoord.c')
-rw-r--r-- | progs/glsl/fragcoord.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/progs/glsl/fragcoord.c b/progs/glsl/fragcoord.c deleted file mode 100644 index 3dfcec87a5..0000000000 --- a/progs/glsl/fragcoord.c +++ /dev/null @@ -1,181 +0,0 @@ -/** - * Test GLSL gl_FragCoord fragment program attribute. - * Color the quad's fragments according to their window position. - * - * Brian Paul - * 20 Nov 2008 - */ - - -#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" - - -static GLint WinWidth = 200, WinHeight = 200; -static char *FragProgFile = NULL; -static char *VertProgFile = NULL; -static GLuint fragShader; -static GLuint vertShader; -static GLuint program; -static GLint win = 0; -static GLboolean Anim = GL_TRUE; -static GLfloat PosX = 0.0, PosY = 0.0; - - -static void -Idle(void) -{ - float r = (WinWidth < WinHeight) ? WinWidth : WinHeight; - float a = glutGet(GLUT_ELAPSED_TIME) * 0.001; - r *= 0.25; - PosX = WinWidth / 2 + r * cos(a); - PosY = WinHeight / 2 + r * sin(a); - - glutPostRedisplay(); -} - - -static void -Redisplay(void) -{ - glClear(GL_COLOR_BUFFER_BIT); - - glPushMatrix(); - glTranslatef(PosX, PosY, 0.0); -#if 0 - glBegin(GL_POLYGON); - glVertex2f(-50, -50); - glVertex2f( 50, -50); - glVertex2f( 50, 50); - glVertex2f(-50, 50); - glEnd(); -#else - glutSolidSphere(50, 20, 10); -#endif - glPopMatrix(); - - glutSwapBuffers(); -} - - -static void -Reshape(int width, int height) -{ - glViewport(0, 0, width, height); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(0, width, 0, height, -55, 55); - - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - - WinWidth = width; - WinHeight = height; -} - - -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; - glutIdleFunc(Anim ? Idle : NULL); - break; - case 27: - CleanUp(); - exit(0); - break; - } - glutPostRedisplay(); -} - - -static void -Init(void) -{ - static const char *fragShaderText = - "void main() { \n" - " vec4 scale = vec4(.005, 0.005, 0.5, 1.0);\n" - " gl_FragColor = gl_FragCoord * scale; \n" - "}\n"; - static const char *vertShaderText = - "void main() {\n" - " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" - "}\n"; - - if (!ShadersSupported()) - exit(1); - - vertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText); - fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText); - program = LinkShaders(vertShader, fragShader); - - glUseProgram(program); - - /*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)); - - glColor3f(1, 0, 0); -} - - -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]; - } - } -} - - -int -main(int argc, char *argv[]) -{ - glutInit(&argc, argv); - glutInitWindowSize(WinWidth, WinHeight); - glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); - win = glutCreateWindow(argv[0]); - glewInit(); - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Redisplay); - ParseOptions(argc, argv); - Init(); - glutIdleFunc(Anim ? Idle : NULL); - glutMainLoop(); - return 0; -} |