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simple texture compression test
This commit is contained in:
Brian Paul
parent
932c2fc291
commit
aecd02b391
2 changed files with 274 additions and 0 deletions
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@ -58,6 +58,7 @@ SOURCES = \
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stencil_wrap.c \
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subtexrate.c \
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tex1d.c \
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texcompress2.c \
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texfilt.c \
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texline.c \
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texobjshare.c \
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273
progs/tests/texcompress2.c
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273
progs/tests/texcompress2.c
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@ -0,0 +1,273 @@
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/*
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* Test texture compression.
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*/
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#define GL_GLEXT_PROTOTYPES
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#include <assert.h>
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#include <stdio.h>
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#include <GL/glut.h>
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#include <GL/glx.h>
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#include "readtex.c"
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#define IMAGE_FILE "../images/arch.rgb"
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static int ImgWidth, ImgHeight;
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static GLenum ImgFormat;
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static GLenum CompFormat;
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static GLfloat EyeDist = 5.0;
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static GLfloat Rot = 0.0;
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const GLenum Target = GL_TEXTURE_2D;
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static void
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CheckError(int line)
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{
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GLenum err = glGetError();
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if (err) {
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printf("GL Error %d at line %d\n", (int) err, line);
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}
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}
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static const char *
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LookupFormat(GLenum format)
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{
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switch (format) {
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case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
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return "GL_COMPRESSED_RGB_S3TC_DXT1_EXT";
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case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
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return "GL_COMPRESSED_RGBA_S3TC_DXT1_EXT";
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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return "GL_COMPRESSED_RGBA_S3TC_DXT3_EXT";
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default:
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return "other";
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}
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}
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static void
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TestSubTex(void)
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{
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GLboolean all = 0*GL_TRUE;
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GLubyte *buffer;
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GLint size, fmt;
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int i;
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glGetTexLevelParameteriv(Target, 0,
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GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &size);
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glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &fmt);
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buffer = (GLubyte *) malloc(size);
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glGetCompressedTexImageARB(Target, 0, buffer);
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printf("Testing sub-texture replacement\n");
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if (all)
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glCompressedTexImage2DARB(Target, 0,
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fmt, ImgWidth, ImgHeight, 0,
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size, buffer);
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else {
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/* bottom half */
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glCompressedTexSubImage2DARB(Target, 0,
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0, 0, /* pos */
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ImgWidth, ImgHeight / 2,
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fmt, size/2, buffer);
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/* top half */
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glCompressedTexSubImage2DARB(Target, 0,
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0, ImgHeight / 2, /* pos */
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ImgWidth, ImgHeight / 2,
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fmt, size/2, buffer + size / 2);
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}
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free(buffer);
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}
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static void
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LoadCompressedImage(const char *file)
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{
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const GLenum filter = GL_LINEAR;
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GLubyte *image;
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GLint p;
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glPixelStorei(GL_PACK_ALIGNMENT, 1);
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/*
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* Load image and scale if needed.
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*/
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image = LoadRGBImage( file, &ImgWidth, &ImgHeight, &ImgFormat );
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if (!image) {
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printf("Couldn't read %s\n", IMAGE_FILE);
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exit(0);
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}
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printf("Image is %d x %d\n", ImgWidth, ImgHeight);
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/* power of two */
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assert(ImgWidth == 128 || ImgWidth == 256 || ImgWidth == 512);
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assert(ImgWidth == 128 || ImgHeight == 256 || ImgHeight == 512);
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if (ImgFormat == GL_RGB)
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CompFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
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else
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CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
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if (ImgFormat == GL_RGBA) {
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int i, numAlpha = 0;
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for (i = 0; i < ImgWidth * ImgHeight; i++) {
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if (image[i*4+3] != 0 && image[i*4+3] != 0xff) {
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numAlpha++;
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}
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if (image[i*4+3] == 0)
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image[i*4+3] = 4 * i / ImgWidth;
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}
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printf("Num Alpha !=0,255: %d\n", numAlpha);
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}
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CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
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/*
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* Give image to OpenGL and have it compress it.
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*/
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glTexImage2D(Target, 0, CompFormat, ImgWidth, ImgHeight, 0,
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ImgFormat, GL_UNSIGNED_BYTE, image);
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CheckError(__LINE__);
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free(image);
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glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &p);
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printf("Compressed Internal Format: %s (0x%x)\n", LookupFormat(p), p);
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assert(p == CompFormat);
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printf("Original size: %d bytes\n", ImgWidth * ImgHeight * 3);
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glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &p);
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printf("Compressed size: %d bytes\n", p);
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glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, filter);
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glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, filter);
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TestSubTex();
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}
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static void
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Init(const char *file)
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{
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GLint numFormats, formats[100];
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GLint p;
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if (!glutExtensionSupported("GL_ARB_texture_compression")) {
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printf("Sorry, GL_ARB_texture_compression is required.\n");
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exit(1);
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}
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if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
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printf("Sorry, GL_EXT_texture_compression_s3tc is required.\n");
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exit(1);
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}
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, &numFormats);
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glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS_ARB, formats);
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printf("%d supported compression formats: ", numFormats);
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for (p = 0; p < numFormats; p++)
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printf("0x%x ", formats[p]);
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printf("\n");
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LoadCompressedImage(file);
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glEnable(GL_TEXTURE_2D);
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if (ImgFormat == GL_RGBA) {
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_BLEND);
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}
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}
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static void
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Reshape( int width, int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum(-1, 1, -1, 1, 4, 100);
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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}
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static void
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Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case 'd':
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EyeDist -= 1.0;
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if (EyeDist < 4.0)
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EyeDist = 4.0;
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break;
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case 'D':
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EyeDist += 1.0;
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break;
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case 'z':
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Rot += 5.0;
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break;
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case 'Z':
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Rot -= 5.0;
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break;
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void
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Draw( void )
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{
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glClearColor(0.3, 0.3, .8, 0);
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glTranslatef(0, 0, -(EyeDist+0.01));
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glRotatef(Rot, 0, 0, 1);
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glBegin(GL_POLYGON);
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glTexCoord2f(0, 0); glVertex2f(-1, -1);
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glTexCoord2f(1, 0); glVertex2f( 1, -1);
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glTexCoord2f(1, 1); glVertex2f( 1, 1);
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glTexCoord2f(0, 1); glVertex2f(-1, 1);
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glEnd();
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glPopMatrix();
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glutSwapBuffers();
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}
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int
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main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowSize( 600, 600 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE);
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glutCreateWindow(argv[0]);
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutDisplayFunc( Draw );
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if (argc > 1)
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Init(argv[1]);
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else
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Init(IMAGE_FILE);
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glutMainLoop();
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return 0;
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}
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