Attachment 14574 Details for Bug 14677 – test case

test case

multitex-case.c (text/plain), 3.13 KB, created by WuNian on 2008-02-26 00:32:17 UTC

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Creator: WuNian

Created: 2008-02-26 00:32:17 UTC

Size: 3.13 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>
>static GLfloat grayColor[4] = {
>   0.5f, 0.5f, 0.5f, 1.0f
>};
>static GLfloat envColors[][4] = {
>   {0.8f, 0.7f, 0.8f, 0.10f},
>   {0.3f, 0.7f, 0.8f, 0.25f},
>   {0.1f, 0.0f, 0.9f, 0.35f},
>   {0.3f, 0.4f, 0.0f, 0.55f},
>};
>
>static GLuint texture;
>static GLint  numTextureUnits = 2, maxNumTextUnits;
>
>static void DrawPoly(void)
>{
>   int i;
>
>   glBegin(GL_QUADS);
>   for (i = 0; i < numTextureUnits; i++) {
>      glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 0, 0);
>   }
>   glVertex2f(0, 0);
>
>   for (i = 0; i < numTextureUnits; i++) {
>      glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 0, 1);
>   }
>   glVertex2f(0, 1.0);
>
>   for (i = 0; i < numTextureUnits; i++) {
>      glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 1, 1);
>   }
>   glVertex2f(1.0, 1.0);
>
>   for (i = 0; i < numTextureUnits; i++) {
>      glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, 1, 0);
>   }
>   glVertex2f(1.0, 0);
>   glEnd();
>}
>
>
>
>static void CreateTexture()
>{
>   glBindTexture (GL_TEXTURE_2D, texture);
>
>   glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, 1, 1, 0,
>	 GL_RGBA, GL_FLOAT, grayColor);
>
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
>
>   glBindTexture (GL_TEXTURE_2D, 0);
>}
>
>void test()
>{
>   GLfloat buf[4];
>   GLint unitNum, j;
>
>   for(unitNum = 0; unitNum < numTextureUnits; unitNum++){
>      glActiveTextureARB (GL_TEXTURE0_ARB + unitNum);
>      glBindTexture(GL_TEXTURE_2D, texture);
>
>      glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColors[unitNum % 4]);
>
>      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
>   }
>
>   for(unitNum = 0; unitNum < numTextureUnits; unitNum++){
>      glActiveTextureARB (GL_TEXTURE0_ARB + unitNum);
>      glEnable(GL_TEXTURE_2D);
>   }
>
>   glClear(GL_COLOR_BUFFER_BIT);
>   glEnable(GL_BLEND);
>   DrawPoly();
>   glReadPixels(0, 0, 1, 1, GL_RGBA, GL_FLOAT, buf);
>   //printf("pixel: %f %f %f\n", buf[0], buf[1], buf[2]);
>
>   glDisable(GL_BLEND);
>   DrawPoly();
>
>   glReadPixels(0, 0, 1, 1, GL_RGB, GL_FLOAT, buf);
>   printf("pixel: %f %f %f\n", buf[0], buf[1], buf[2]);
>}
>
>void init(void)
>{
>   glGetIntegerv (GL_MAX_TEXTURE_UNITS_ARB, &maxNumTextUnits);
>   printf("num texture units: %d\n", maxNumTextUnits);
>   glDisable(GL_DITHER);
>   glClearColor(1.0, 1.0, 1.0, 1.0);
>   glBlendFunc (GL_ZERO, GL_SRC_ALPHA);
>   glShadeModel (GL_FLAT);
>
>   glGenTextures(1, &texture);
>   CreateTexture();
>
>   glColor4f (0.6, 0.6, 0.6, 0.0);
>}
>
>void display(void)
>{
>   glViewport(0, 0, WINDSIZEX, WINDSIZEY);
>   glMatrixMode(GL_PROJECTION);
>   glLoadIdentity();
>   gluOrtho2D(0, WINDSIZEX, 0, WINDSIZEY);
>   glMatrixMode(GL_MODELVIEW);
>   glLoadIdentity();
>
>   test();
>}
>
>int main(int argc, char** argv)
>{
>   glutInit(&argc, argv);
>   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
>   glutInitWindowSize(WINDSIZEX, WINDSIZEY);
>   glutInitWindowPosition(100, 100);
>   glutCreateWindow(argv[0]);
>   init();
>   glutDisplayFunc(display);
>   glutMainLoop();
>   return 0; 
>}

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Attachments on bug 14677: 14574

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