bool detexCalculateDynamicRange(uint8_t *pixel_buffer, int nu_pixels, uint32_t pixel_format,
float *range_min_out, float *range_max_out) {
if (~(pixel_format & DETEX_PIXEL_FORMAT_FLOAT_BIT)) {
detexSetErrorMessage("detexCalculateDynamicRange: Pixel buffer not in float format");
return false;
}
if (pixel_format & DETEX_PIXEL_FORMAT_16BIT_COMPONENT_BIT) {
CalculateRangeHalfFloat((uint16_t *)pixel_buffer,
nu_pixels * detexGetPixelSize(pixel_format) / 2,
range_min_out, range_max_out);
return true;
}
else if (pixel_format & DETEX_PIXEL_FORMAT_32BIT_COMPONENT_BIT) {
CalculateRangeFloat((float *)pixel_buffer,
nu_pixels * detexGetPixelSize(pixel_format) / 4,
range_min_out, range_max_out);
return true;
}
else {
detexSetErrorMessage("detexCalculateDynamicRange: Unable to handle pixel buffer format");
return false;
}
}
// Look-up texture file info for DDS file format based on DX format parameters.
const detexTextureFileInfo *detexLookupDDSFileInfo(const char *four_cc, int dx10_format,
uint32_t pixel_format_flags, int bitcount, uint32_t red_mask, uint32_t green_mask,
uint32_t blue_mask, uint32_t alpha_mask) {
for (int i = 0; i < DETEX_NU_TEXTURE_INFO_ENTRIES; i++)
if (strncmp(four_cc, "DX10", 4) == 0) {
if (texture_info[i].dx10_format == dx10_format)
return &texture_info[i];
}
else
if (texture_info[i].dx_four_cc[0] != '\0' &&
strncmp(texture_info[i].dx_four_cc, four_cc, 4) == 0)
return &texture_info[i];
else {
uint32_t format = texture_info[i].texture_format;
if ((pixel_format_flags & DDPF_RGB) &&
!detexFormatIsCompressed(format)) {
// Uncompressed format. Match component masks.
if (bitcount <= 32) {
int format_bitcount = detexGetPixelSize(format) * 8;
uint64_t format_red_mask, format_green_mask, format_blue_mask,
format_alpha_mask;
detexGetComponentMasks(format, &format_red_mask, &format_green_mask,
&format_blue_mask, &format_alpha_mask);
if (format_bitcount == bitcount &&
format_red_mask == red_mask &&
format_green_mask == green_mask &&
format_blue_mask == blue_mask &&
((pixel_format_flags & DDPF_ALPHAPIXELS) == 0 ||
format_alpha_mask == alpha_mask))
return &texture_info[i];
}
}
// Detect old alpha format.
if ((pixel_format_flags & DDPF_ALPHA) && bitcount == 8 &&
format == DETEX_PIXEL_FORMAT_A8)
return &texture_info[i];
}
for (int i = 0; i < DETEX_NU_DDS_SYNONYMS; i++)
if (strncmp(four_cc, "DX10", 4) == 0) {
if (dds_synonym[i].dx10_format == dx10_format)
return detexLookupTextureFormatFileInfo(dds_synonym[i].texture_format);
}
else if (dds_synonym[i].dx10_four_cc[0] != '\0' &&
strncmp(dds_synonym[i].dx10_four_cc, four_cc, 4) == 0)
return detexLookupTextureFormatFileInfo(dds_synonym[i].texture_format);
return NULL;
}
