From f10469abe8de3f682a2045c202bab59f43be7463 Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Thu, 17 Aug 2006 13:25:14 +0000 Subject: [PATCH] add dependent texture read test --- progs/trivial/Makefile | 1 + progs/trivial/quad-tex-dep.c | 245 +++++++++++++++++++++++++++++++++++ 2 files changed, 246 insertions(+) create mode 100644 progs/trivial/quad-tex-dep.c diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile index 90381b6dc5a..b9ed5c70dc5 100644 --- a/progs/trivial/Makefile +++ b/progs/trivial/Makefile @@ -40,6 +40,7 @@ SOURCES = \ quad-tex-2d.c \ quad-tex-pbo.c \ quad-tex-3d.c \ + quad-tex-dep.c \ quad.c \ quads.c \ quadstrip.c \ diff --git a/progs/trivial/quad-tex-dep.c b/progs/trivial/quad-tex-dep.c new file mode 100644 index 00000000000..196a95da74a --- /dev/null +++ b/progs/trivial/quad-tex-dep.c @@ -0,0 +1,245 @@ + +#include +#include +#include +#include +#define GL_GLEXT_PROTOTYPES +#include + + + +GLenum doubleBuffer; + +/* Demonstrate an equivalent to paletted texturing using fragment + * programs and dependent texturing. This requires at least one + * texture unit to be reserved for the palette lookup. + */ + +static void Init( void ) +{ + static const char *modulate2D = + "!!ARBfp1.0\n" + "TEMP index; \n" + "TEX index, fragment.texcoord[0], texture[0], 2D; \n" + "TEX result.color, index, texture[1], 1D; \n" + "END" + ; + GLuint modulateProg; + GLuint Texture; + + 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)); + assert(glIsProgramARB(modulateProg)); + + glEnable(GL_FRAGMENT_PROGRAM_ARB); + + + { +#define HEIGHT 8 +#define WIDTH 32 + +#define B 0 +#define G 1 +#define R 2 +#define A 3 + + static char texture[HEIGHT * WIDTH + 1] = + " " + " MMM EEEE SSS AAA " + " M M M E S S A A " + " M M M EEEE SS A A " + " M M M E SS AAAAA " + " M M E S S A A " + " M M EEEE SSS A A "; + + GLubyte table[256][4]; + + + + /* load the color table for each texel-index */ + memset(table, 0xff, 256*4); + table[' '][B] = 255; + table[' '][G] = 255; + table[' '][R] = 255; + table[' '][A] = 64; + table['M'][B] = 0; + table['M'][G] = 0; + table['M'][R] = 255; + table['M'][A] = 255; + table['E'][B] = 0; + table['E'][G] = 255; + table['E'][R] = 0; + table['E'][A] = 255; + table['S'][B] = 255; + table['S'][G] = 0; + table['S'][R] = 0; + table['S'][A] = 255; + table['A'][B] = 0; + table['A'][G] = 255; + table['A'][R] = 255; + table['A'][A] = 255; + + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + + + /* Load indexed texture as a 2D I8 texture */ + glActiveTextureARB(GL_TEXTURE0_ARB); + glGenTextures(1, &Texture); + glBindTexture(GL_TEXTURE_2D, Texture); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + + glTexImage2D(GL_TEXTURE_2D, /* target */ + 0, /* level */ + GL_INTENSITY, /* internal format */ + WIDTH, HEIGHT, /* width, height */ + 0, /* border */ + GL_LUMINANCE, /* texture format */ + GL_UNSIGNED_BYTE, /* texture type */ + texture); /* the texture */ + + + 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_TEXTURE_2D); + + /* Load "pallete" as a 1D BGRA8888 texture */ + glActiveTextureARB(GL_TEXTURE1_ARB); + glGenTextures(1, &Texture); + glBindTexture(GL_TEXTURE_1D, Texture); + + glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + + glTexImage1D(GL_TEXTURE_1D, /* target */ + 0, /* level */ + GL_RGBA, /* internal format */ + 256, /* width */ + 0, /* border */ + GL_BGRA, /* texture format */ + GL_UNSIGNED_BYTE, /* texture type */ + table); /* the texture */ + + glEnable(GL_TEXTURE_1D); + +/* glEnable(GL_BLEND); */ +/* glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); */ +#undef HEIGHT +#undef WIDTH + } + + + 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); + + glBegin(GL_QUADS); + glTexCoord2f(1,1); + glVertex3f( 0.9, -0.9, -30.0); + glTexCoord2f(1,0); + glVertex3f( 0.9, 0.9, -30.0); + glTexCoord2f(0,0); + glVertex3f(-0.9, 0.9, -30.0); + glTexCoord2f(0,1); + glVertex3f(-0.9, -0.9, -30.0); + glEnd(); + + glFlush(); + + if (doubleBuffer) { + glutSwapBuffers(); + } + + +} + +static GLenum Args(int argc, char **argv) +{ + GLint i; + + doubleBuffer = GL_FALSE; + + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-sb") == 0) { + doubleBuffer = GL_FALSE; + } else if (strcmp(argv[i], "-db") == 0) { + doubleBuffer = GL_TRUE; + } else { + fprintf(stderr, "%s (Bad option).\n", argv[i]); + return GL_FALSE; + } + } + return GL_TRUE; +} + +int main(int argc, char **argv) +{ + GLenum type; + + glutInit(&argc, argv); + + if (Args(argc, argv) == GL_FALSE) { + exit(1); + } + + glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); + + type = GLUT_RGB; + type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; + glutInitDisplayMode(type); + + if (glutCreateWindow("First Tri") == GL_FALSE) { + exit(1); + } + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +}