73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
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typedef struct {
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size_t sizeX, sizeY;
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GLubyte *data;
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} PPMImage;
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static PPMImage *LoadPPM(const char *filename)
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{
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char buff[16];
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PPMImage *result;
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FILE *fp;
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int maxval;
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fp = fopen(filename, "rb");
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if (!fp)
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{
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fprintf(stderr, "Unable to open file `%s'\n", filename);
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exit(1);
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}
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if (!fgets(buff, sizeof(buff), fp))
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{
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perror(filename);
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exit(1);
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}
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if (buff[0] != 'P' || buff[1] != '6')
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{
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fprintf(stderr, "Invalid image format (must be `P6')\n");
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exit(1);
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}
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result = (PPMImage *) malloc(sizeof(PPMImage));
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if (!result)
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{
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fprintf(stderr, "Unable to allocate memory\n");
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exit(1);
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}
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if (fscanf(fp, "%lu %lu", &result->sizeX, &result->sizeY) != 2)
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{
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fprintf(stderr, "Error loading image `%s'\n", filename);
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exit(1);
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}
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if (fscanf(fp, "%d", &maxval) != 1)
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{
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fprintf(stderr, "Error loading image `%s'\n", filename);
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exit(1);
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}
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while (fgetc(fp) != '\n')
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;
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result->data = (GLubyte *) malloc(3 * result->sizeX * result->sizeY);
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if (!result)
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{
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fprintf(stderr, "Unable to allocate memory\n");
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exit(1);
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}
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if (fread(result->data, 3 * result->sizeX, result->sizeY, fp) != result->sizeY)
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{
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fprintf(stderr, "Error loading image `%s'\n", filename);
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exit(1);
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}
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fclose(fp);
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return result;
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}
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