/**
* glGetTexImage for color formats (RGBA, RGB, alpha, LA, etc).
* Compressed textures are handled here as well.
*/
static void
get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
GLbitfield transferOps = 0x0;
/* In general, clamping does not apply to glGetTexImage, except when
* the returned type of the image can't hold negative values.
*/
if (type_needs_clamping(type)) {
/* the returned image type can't have negative values */
if (dataType == GL_FLOAT ||
dataType == GL_SIGNED_NORMALIZED ||
format == GL_LUMINANCE ||
format == GL_LUMINANCE_ALPHA) {
transferOps |= IMAGE_CLAMP_BIT;
}
}
if (_mesa_is_format_compressed(texImage->TexFormat)) {
get_tex_rgba_compressed(ctx, dimensions, format, type,
pixels, texImage, transferOps);
}
else {
get_tex_rgba_uncompressed(ctx, dimensions, format, type,
pixels, texImage, transferOps);
}
}
/**
* glGetTexImage for color formats (RGBA, RGB, alpha, LA, etc).
* Compressed textures are handled here as well.
*/
static void
get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
GLenum format, GLenum type, GLvoid *pixels,
struct gl_texture_image *texImage)
{
const GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
GLbitfield transferOps = 0x0;
/* In general, clamping does not apply to glGetTexImage, except when
* the returned type of the image can't hold negative values.
*/
if (type_needs_clamping(type)) {
/* the returned image type can't have negative values */
if (dataType == GL_FLOAT ||
dataType == GL_SIGNED_NORMALIZED ||
format == GL_LUMINANCE ||
format == GL_LUMINANCE_ALPHA) {
transferOps |= IMAGE_CLAMP_BIT;
}
}
/* This applies to RGB, RGBA textures. if the format is either LUMINANCE
* or LUMINANCE ALPHA, luminance (L) is computed as L=R+G+B .we need to
* clamp the sum to [0,1].
*/
else if ((format == GL_LUMINANCE ||
format == GL_LUMINANCE_ALPHA) &&
dataType == GL_UNSIGNED_NORMALIZED) {
transferOps |= IMAGE_CLAMP_BIT;
}
get_tex_rgba_uncompressed(ctx, dimensions, format, type,
pixels, texImage, transferOps);
}
