Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Test texture compression. |
| 3 | */ |
| 4 | |
| 5 | |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 6 | #include <assert.h> |
| 7 | #include <stdio.h> |
Keith Whitwell | a58065d | 2009-03-10 13:11:23 +0000 | [diff] [blame] | 8 | #include <GL/glew.h> |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 9 | #include <GL/glut.h> |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 10 | #include "readtex.c" |
| 11 | |
| 12 | #define IMAGE_FILE "../images/arch.rgb" |
| 13 | |
| 14 | static int ImgWidth, ImgHeight; |
| 15 | static GLenum ImgFormat; |
| 16 | static GLenum CompFormat; |
| 17 | static GLfloat EyeDist = 5.0; |
| 18 | static GLfloat Rot = 0.0; |
| 19 | const GLenum Target = GL_TEXTURE_2D; |
| 20 | |
| 21 | |
| 22 | static void |
| 23 | CheckError(int line) |
| 24 | { |
| 25 | GLenum err = glGetError(); |
| 26 | if (err) { |
| 27 | printf("GL Error %d at line %d\n", (int) err, line); |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | |
| 32 | static const char * |
| 33 | LookupFormat(GLenum format) |
| 34 | { |
| 35 | switch (format) { |
| 36 | case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: |
| 37 | return "GL_COMPRESSED_RGB_S3TC_DXT1_EXT"; |
| 38 | case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: |
| 39 | return "GL_COMPRESSED_RGBA_S3TC_DXT1_EXT"; |
| 40 | case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: |
| 41 | return "GL_COMPRESSED_RGBA_S3TC_DXT3_EXT"; |
| 42 | default: |
| 43 | return "other"; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | |
| 48 | static void |
| 49 | TestSubTex(void) |
| 50 | { |
| 51 | GLboolean all = 0*GL_TRUE; |
| 52 | GLubyte *buffer; |
| 53 | GLint size, fmt; |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 54 | |
| 55 | glGetTexLevelParameteriv(Target, 0, |
| 56 | GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &size); |
| 57 | glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &fmt); |
| 58 | |
| 59 | buffer = (GLubyte *) malloc(size); |
| 60 | glGetCompressedTexImageARB(Target, 0, buffer); |
| 61 | |
| 62 | printf("Testing sub-texture replacement\n"); |
| 63 | if (all) |
| 64 | glCompressedTexImage2DARB(Target, 0, |
| 65 | fmt, ImgWidth, ImgHeight, 0, |
| 66 | size, buffer); |
| 67 | else { |
| 68 | /* bottom half */ |
| 69 | glCompressedTexSubImage2DARB(Target, 0, |
| 70 | 0, 0, /* pos */ |
| 71 | ImgWidth, ImgHeight / 2, |
| 72 | fmt, size/2, buffer); |
| 73 | /* top half */ |
| 74 | glCompressedTexSubImage2DARB(Target, 0, |
| 75 | 0, ImgHeight / 2, /* pos */ |
| 76 | ImgWidth, ImgHeight / 2, |
| 77 | fmt, size/2, buffer + size / 2); |
| 78 | } |
| 79 | |
| 80 | free(buffer); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | static void |
Jakob Bornecrantz | 82e92ee | 2009-04-15 23:36:22 +0200 | [diff] [blame] | 85 | TestGetTex(void) |
| 86 | { |
| 87 | GLubyte *buffer; |
| 88 | |
| 89 | buffer = (GLubyte *) malloc(3 * ImgWidth * ImgHeight); |
| 90 | |
| 91 | glGetTexImage(GL_TEXTURE_2D, |
| 92 | 0, |
| 93 | GL_RGB, |
| 94 | GL_UNSIGNED_BYTE, |
| 95 | buffer); |
| 96 | |
| 97 | free(buffer); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | static void |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 102 | LoadCompressedImage(const char *file) |
| 103 | { |
| 104 | const GLenum filter = GL_LINEAR; |
| 105 | GLubyte *image; |
| 106 | GLint p; |
| 107 | |
| 108 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| 109 | glPixelStorei(GL_PACK_ALIGNMENT, 1); |
| 110 | |
| 111 | /* |
| 112 | * Load image and scale if needed. |
| 113 | */ |
| 114 | image = LoadRGBImage( file, &ImgWidth, &ImgHeight, &ImgFormat ); |
| 115 | if (!image) { |
| 116 | printf("Couldn't read %s\n", IMAGE_FILE); |
| 117 | exit(0); |
| 118 | } |
| 119 | printf("Image is %d x %d\n", ImgWidth, ImgHeight); |
| 120 | |
| 121 | /* power of two */ |
| 122 | assert(ImgWidth == 128 || ImgWidth == 256 || ImgWidth == 512); |
| 123 | assert(ImgWidth == 128 || ImgHeight == 256 || ImgHeight == 512); |
| 124 | |
| 125 | if (ImgFormat == GL_RGB) |
| 126 | CompFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT; |
| 127 | else |
| 128 | CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; |
| 129 | |
| 130 | if (ImgFormat == GL_RGBA) { |
| 131 | int i, numAlpha = 0; |
| 132 | for (i = 0; i < ImgWidth * ImgHeight; i++) { |
| 133 | if (image[i*4+3] != 0 && image[i*4+3] != 0xff) { |
| 134 | numAlpha++; |
| 135 | } |
| 136 | if (image[i*4+3] == 0) |
| 137 | image[i*4+3] = 4 * i / ImgWidth; |
| 138 | } |
| 139 | printf("Num Alpha !=0,255: %d\n", numAlpha); |
| 140 | } |
| 141 | |
| 142 | CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; |
| 143 | |
| 144 | |
| 145 | /* |
| 146 | * Give image to OpenGL and have it compress it. |
| 147 | */ |
| 148 | glTexImage2D(Target, 0, CompFormat, ImgWidth, ImgHeight, 0, |
| 149 | ImgFormat, GL_UNSIGNED_BYTE, image); |
| 150 | CheckError(__LINE__); |
| 151 | |
| 152 | free(image); |
| 153 | |
| 154 | glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &p); |
| 155 | printf("Compressed Internal Format: %s (0x%x)\n", LookupFormat(p), p); |
| 156 | assert(p == CompFormat); |
| 157 | |
| 158 | printf("Original size: %d bytes\n", ImgWidth * ImgHeight * 3); |
| 159 | glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &p); |
| 160 | printf("Compressed size: %d bytes\n", p); |
| 161 | |
| 162 | glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, filter); |
| 163 | glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, filter); |
| 164 | |
Jakob Bornecrantz | 82e92ee | 2009-04-15 23:36:22 +0200 | [diff] [blame] | 165 | if (0) |
| 166 | TestSubTex(); |
| 167 | else |
| 168 | TestGetTex(); |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 169 | |
| 170 | } |
| 171 | |
| 172 | |
| 173 | static void |
| 174 | Init(const char *file) |
| 175 | { |
| 176 | GLint numFormats, formats[100]; |
| 177 | GLint p; |
| 178 | |
| 179 | if (!glutExtensionSupported("GL_ARB_texture_compression")) { |
| 180 | printf("Sorry, GL_ARB_texture_compression is required.\n"); |
| 181 | exit(1); |
| 182 | } |
| 183 | if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) { |
| 184 | printf("Sorry, GL_EXT_texture_compression_s3tc is required.\n"); |
| 185 | exit(1); |
| 186 | } |
| 187 | |
| 188 | printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| 189 | printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| 190 | |
| 191 | glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, &numFormats); |
| 192 | glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS_ARB, formats); |
| 193 | printf("%d supported compression formats: ", numFormats); |
| 194 | for (p = 0; p < numFormats; p++) |
| 195 | printf("0x%x ", formats[p]); |
| 196 | printf("\n"); |
| 197 | |
| 198 | LoadCompressedImage(file); |
| 199 | |
| 200 | glEnable(GL_TEXTURE_2D); |
| 201 | |
| 202 | if (ImgFormat == GL_RGBA) { |
| 203 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| 204 | glEnable(GL_BLEND); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | |
| 209 | static void |
| 210 | Reshape( int width, int height ) |
| 211 | { |
| 212 | glViewport( 0, 0, width, height ); |
| 213 | glMatrixMode( GL_PROJECTION ); |
| 214 | glLoadIdentity(); |
| 215 | glFrustum(-1, 1, -1, 1, 4, 100); |
| 216 | glMatrixMode( GL_MODELVIEW ); |
| 217 | glLoadIdentity(); |
| 218 | } |
| 219 | |
| 220 | |
| 221 | static void |
| 222 | Key( unsigned char key, int x, int y ) |
| 223 | { |
| 224 | (void) x; |
| 225 | (void) y; |
| 226 | switch (key) { |
| 227 | case 'd': |
| 228 | EyeDist -= 1.0; |
| 229 | if (EyeDist < 4.0) |
| 230 | EyeDist = 4.0; |
| 231 | break; |
| 232 | case 'D': |
| 233 | EyeDist += 1.0; |
| 234 | break; |
| 235 | case 'z': |
| 236 | Rot += 5.0; |
| 237 | break; |
| 238 | case 'Z': |
| 239 | Rot -= 5.0; |
| 240 | break; |
| 241 | case 27: |
| 242 | exit(0); |
| 243 | break; |
| 244 | } |
| 245 | glutPostRedisplay(); |
| 246 | } |
| 247 | |
| 248 | |
| 249 | static void |
| 250 | Draw( void ) |
| 251 | { |
| 252 | glClearColor(0.3, 0.3, .8, 0); |
| 253 | glClear(GL_COLOR_BUFFER_BIT); |
| 254 | |
| 255 | glPushMatrix(); |
| 256 | glTranslatef(0, 0, -(EyeDist+0.01)); |
| 257 | glRotatef(Rot, 0, 0, 1); |
| 258 | glBegin(GL_POLYGON); |
| 259 | glTexCoord2f(0, 0); glVertex2f(-1, -1); |
| 260 | glTexCoord2f(1, 0); glVertex2f( 1, -1); |
| 261 | glTexCoord2f(1, 1); glVertex2f( 1, 1); |
| 262 | glTexCoord2f(0, 1); glVertex2f(-1, 1); |
| 263 | glEnd(); |
| 264 | glPopMatrix(); |
| 265 | |
| 266 | glutSwapBuffers(); |
| 267 | } |
| 268 | |
| 269 | |
| 270 | int |
| 271 | main( int argc, char *argv[] ) |
| 272 | { |
| 273 | glutInit( &argc, argv ); |
| 274 | glutInitWindowSize( 600, 600 ); |
| 275 | |
| 276 | glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE); |
| 277 | |
| 278 | glutCreateWindow(argv[0]); |
Keith Whitwell | a58065d | 2009-03-10 13:11:23 +0000 | [diff] [blame] | 279 | glewInit(); |
Brian Paul | aecd02b | 2006-05-10 22:47:06 +0000 | [diff] [blame] | 280 | |
| 281 | glutReshapeFunc( Reshape ); |
| 282 | glutKeyboardFunc( Key ); |
| 283 | glutDisplayFunc( Draw ); |
| 284 | |
| 285 | if (argc > 1) |
| 286 | Init(argv[1]); |
| 287 | else |
| 288 | Init(IMAGE_FILE); |
| 289 | |
| 290 | glutMainLoop(); |
| 291 | return 0; |
| 292 | } |