diff options
Diffstat (limited to 'progs/glsl/vert-or-frag-only.c')
-rw-r--r-- | progs/glsl/vert-or-frag-only.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/progs/glsl/vert-or-frag-only.c b/progs/glsl/vert-or-frag-only.c deleted file mode 100644 index 148991ca83..0000000000 --- a/progs/glsl/vert-or-frag-only.c +++ /dev/null @@ -1,187 +0,0 @@ -/** - * Draw two quads, one using only a vertex shader, the other only with a - * fragment shader. They should appear the same. - * 17 Dec 2008 - * Brian Paul - */ - - -#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 char *FragProgFile = NULL; -static char *VertProgFile = NULL; -static GLuint FragShader; -static GLuint VertShader; -static GLuint VertProgram; /* w/out vertex shader */ -static GLuint FragProgram; /* w/out fragment shader */ -static GLint Win = 0; - - -static void -DrawQuadColor(void) -{ - glBegin(GL_QUADS); - glColor3f(1, 0, 0); glVertex2f(-1, -1); - glColor3f(0, 1, 0); glVertex2f( 1, -1); - glColor3f(0, 0, 1); glVertex2f( 1, 1); - glColor3f(1, 0, 1); glVertex2f(-1, 1); - glEnd(); -} - - -/** as above, but specify color via texcoords */ -static void -DrawQuadTex(void) -{ - glBegin(GL_QUADS); - glTexCoord3f(1, 0, 0); glVertex2f(-1, -1); - glTexCoord3f(0, 1, 0); glVertex2f( 1, -1); - glTexCoord3f(0, 0, 1); glVertex2f( 1, 1); - glTexCoord3f(1, 0, 1); glVertex2f(-1, 1); - glEnd(); -} - - -static void -Redisplay(void) -{ - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); - - /* render with vertex shader only */ - glUseProgram(VertProgram); - glPushMatrix(); - glTranslatef(-1.5, 0, 0); - DrawQuadTex(); - glPopMatrix(); - - /* render with fragment shader only */ - glUseProgram(FragProgram); - glPushMatrix(); - glTranslatef(+1.5, 0, 0); - DrawQuadColor(); - glPopMatrix(); - - glutSwapBuffers(); -} - - -static void -Reshape(int width, int height) -{ - glViewport(0, 0, width, height); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(-4, 4, -2, 2, -1, 1); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); -} - - -static void -CleanUp(void) -{ - glDeleteShader(FragShader); - glDeleteShader(VertShader); - glDeleteProgram(VertProgram); - glDeleteProgram(FragProgram); - glutDestroyWindow(Win); -} - - -static void -Key(unsigned char key, int x, int y) -{ - (void) x; - (void) y; - switch(key) { - case 27: - CleanUp(); - exit(0); - break; - } - glutPostRedisplay(); -} - - -static void -Init(void) -{ - static const char *fragShaderText = - "void main() {\n" - " gl_FragColor = gl_Color;\n" - "}\n"; - static const char *vertShaderText = - "void main() {\n" - " gl_Position = ftransform();\n" - " gl_FrontColor = gl_MultiTexCoord0;\n" /* see DrawQuadTex() */ - "}\n"; - - if (!ShadersSupported()) - exit(1); - - if (FragProgFile) - FragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile); - else - FragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText); - - if (VertProgFile) - VertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile); - else - VertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText); - - VertProgram = LinkShaders(VertShader, 0); - FragProgram = LinkShaders(0, FragShader); - - glClearColor(0.3f, 0.3f, 0.3f, 0.0f); - glEnable(GL_DEPTH_TEST); - - printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); - - assert(glIsProgram(VertProgram)); - assert(glIsProgram(FragProgram)); - 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(400, 200); - glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); - Win = glutCreateWindow(argv[0]); - glewInit(); - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Redisplay); - ParseOptions(argc, argv); - Init(); - glutMainLoop(); - return 0; -} |