diff options
-rw-r--r-- | progs/fp/point-position.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/progs/fp/point-position.c b/progs/fp/point-position.c new file mode 100644 index 0000000..c352a93 --- /dev/null +++ b/progs/fp/point-position.c @@ -0,0 +1,119 @@ + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#define GL_GLEXT_PROTOTYPES +#include <GL/glut.h> +#include "GL/gl.h" + + + +static void Init( void ) +{ + static const char *modulate2D = + "!!ARBfp1.0\n" + "MUL result.color, fragment.position, {.005}.x; \n" + "END" + ; + GLuint modulateProg; + + if (!glutExtensionSupported("GL_ARB_fragment_program")) { + printf("Error: GL_ARB_fragment_program not supported!\n"); + exit(1); + } + printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + + /* Setup the fragment program */ + glGenProgramsARB(1, &modulateProg); + glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg); + glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, + strlen(modulate2D), (const GLubyte *)modulate2D); + + printf("glGetError = 0x%x\n", (int) glGetError()); + printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n", + (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB)); + + glEnable(GL_FRAGMENT_PROGRAM_ARB); + + glClearColor(.3, .3, .3, 0); +} + +static void Reshape(int width, int height) +{ + + glViewport(0, 0, (GLint)width, (GLint)height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); + glMatrixMode(GL_MODELVIEW); +} + +static void Key(unsigned char key, int x, int y) +{ + + switch (key) { + case 27: + exit(1); + default: + return; + } + + glutPostRedisplay(); +} + +static void Draw(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + +#if 0 + glBegin(GL_QUADS); + glTexCoord2f(1,0); + glVertex3f( 0.9, -0.9, -30.0); + glTexCoord2f(1,1); + glVertex3f( 0.9, 0.9, -30.0); + glTexCoord2f(0,1); + glVertex3f(-0.9, 0.9, -30.0); + glTexCoord2f(0,0); + glVertex3f(-0.9, -0.9, -30.0); + glEnd(); +#else + glPointSize(100); + glBegin(GL_POINTS); + glColor3f(0,0,1); + glVertex3f( 0, 0, -30.0); + glEnd(); +#endif + + glFlush(); + + +} + + +int main(int argc, char **argv) +{ + GLenum type; + + glutInit(&argc, argv); + + + + glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); + + type = GLUT_RGB; + type |= GLUT_SINGLE; + glutInitDisplayMode(type); + + if (glutCreateWindow("First Tri") == GL_FALSE) { + exit(1); + } + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +} |