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-rw-r--r--mesalib/src/mesa/main/pack.c91
-rw-r--r--mesalib/src/mesa/main/pack.h7
-rw-r--r--mesalib/src/mesa/main/readpix.c4
-rw-r--r--mesalib/src/mesa/main/texgetimage.c77
4 files changed, 106 insertions, 73 deletions
diff --git a/mesalib/src/mesa/main/pack.c b/mesalib/src/mesa/main/pack.c
index 41485a1bf..4d4b4a825 100644
--- a/mesalib/src/mesa/main/pack.c
+++ b/mesalib/src/mesa/main/pack.c
@@ -5250,3 +5250,94 @@ _mesa_unpack_image( GLuint dimensions,
}
}
+
+
+/**
+ * If we unpack colors from a luminance surface, we'll get pixel colors
+ * such as (l, l, l, a).
+ * When we call _mesa_pack_rgba_span_float(format=GL_LUMINANCE), that
+ * function will compute L=R+G+B before packing. The net effect is we'll
+ * accidentally store luminance values = 3*l.
+ * This function compensates for that by converting (aka rebasing) (l,l,l,a)
+ * to be (l,0,0,a).
+ * It's a similar story for other formats such as LUMINANCE_ALPHA, ALPHA
+ * and INTENSITY.
+ *
+ * Finally, we also need to do this when the actual surface format does
+ * not match the logical surface format. For example, suppose the user
+ * requests a GL_LUMINANCE texture but the driver stores it as RGBA.
+ * Again, we'll get pixel values like (l,l,l,a).
+ */
+void
+_mesa_rebase_rgba_float(GLuint n, GLfloat rgba[][4], GLenum baseFormat)
+{
+ GLuint i;
+
+ switch (baseFormat) {
+ case GL_ALPHA:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = 0.0F;
+ rgba[i][GCOMP] = 0.0F;
+ rgba[i][BCOMP] = 0.0F;
+ }
+ break;
+ case GL_INTENSITY:
+ /* fall-through */
+ case GL_LUMINANCE:
+ for (i = 0; i < n; i++) {
+ rgba[i][GCOMP] = 0.0F;
+ rgba[i][BCOMP] = 0.0F;
+ rgba[i][ACOMP] = 1.0F;
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i = 0; i < n; i++) {
+ rgba[i][GCOMP] = 0.0F;
+ rgba[i][BCOMP] = 0.0F;
+ }
+ break;
+ default:
+ /* no-op */
+ ;
+ }
+}
+
+
+/**
+ * As above, but GLuint components.
+ */
+void
+_mesa_rebase_rgba_uint(GLuint n, GLuint rgba[][4], GLenum baseFormat)
+{
+ GLuint i;
+
+ switch (baseFormat) {
+ case GL_ALPHA:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = 0;
+ rgba[i][GCOMP] = 0;
+ rgba[i][BCOMP] = 0;
+ }
+ break;
+ case GL_INTENSITY:
+ /* fall-through */
+ case GL_LUMINANCE:
+ for (i = 0; i < n; i++) {
+ rgba[i][GCOMP] = 0;
+ rgba[i][BCOMP] = 0;
+ rgba[i][ACOMP] = 1;
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i = 0; i < n; i++) {
+ rgba[i][GCOMP] = 0;
+ rgba[i][BCOMP] = 0;
+ }
+ break;
+ default:
+ /* no-op */
+ ;
+ }
+}
+
+
diff --git a/mesalib/src/mesa/main/pack.h b/mesalib/src/mesa/main/pack.h
index b1853cd59..cd49c7495 100644
--- a/mesalib/src/mesa/main/pack.h
+++ b/mesalib/src/mesa/main/pack.h
@@ -149,4 +149,11 @@ _mesa_pack_rgba_span_int(struct gl_context *ctx, GLuint n, GLuint rgba[][4],
GLenum dstFormat, GLenum dstType,
GLvoid *dstAddr);
+
+extern void
+_mesa_rebase_rgba_float(GLuint n, GLfloat rgba[][4], GLenum baseFormat);
+
+extern void
+_mesa_rebase_rgba_uint(GLuint n, GLuint rgba[][4], GLenum baseFormat);
+
#endif
diff --git a/mesalib/src/mesa/main/readpix.c b/mesalib/src/mesa/main/readpix.c
index 3384d8a38..491854955 100644
--- a/mesalib/src/mesa/main/readpix.c
+++ b/mesalib/src/mesa/main/readpix.c
@@ -291,10 +291,14 @@ slow_read_rgba_pixels( struct gl_context *ctx,
for (j = 0; j < height; j++) {
if (_mesa_is_integer_format(format)) {
_mesa_unpack_uint_rgba_row(rbFormat, width, map, (GLuint (*)[4]) rgba);
+ _mesa_rebase_rgba_uint(width, (GLuint (*)[4]) rgba,
+ rb->_BaseFormat);
_mesa_pack_rgba_span_int(ctx, width, (GLuint (*)[4]) rgba, format,
type, dst);
} else {
_mesa_unpack_rgba_row(rbFormat, width, map, (GLfloat (*)[4]) rgba);
+ _mesa_rebase_rgba_float(width, (GLfloat (*)[4]) rgba,
+ rb->_BaseFormat);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format,
type, dst, packing, transferOps);
}
diff --git a/mesalib/src/mesa/main/texgetimage.c b/mesalib/src/mesa/main/texgetimage.c
index a02a49156..44a828adf 100644
--- a/mesalib/src/mesa/main/texgetimage.c
+++ b/mesalib/src/mesa/main/texgetimage.c
@@ -266,13 +266,8 @@ get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions,
if (baseFormat == GL_LUMINANCE ||
baseFormat == GL_LUMINANCE_ALPHA) {
- /* Set green and blue to zero since the pack function here will
- * compute L=R+G+B.
- */
- GLuint i;
- for (i = 0; i < width * height; i++) {
- tempImage[i * 4 + GCOMP] = tempImage[i * 4 + BCOMP] = 0.0f;
- }
+ _mesa_rebase_rgba_float(width * height, (GLfloat (*)[4]) tempImage,
+ baseFormat);
}
srcRow = tempImage;
@@ -340,76 +335,12 @@ get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions,
if (is_integer) {
_mesa_unpack_uint_rgba_row(texFormat, width, src, rgba_uint);
-
- if (texImage->_BaseFormat == GL_ALPHA) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba_uint[col][RCOMP] = 0;
- rgba_uint[col][GCOMP] = 0;
- rgba_uint[col][BCOMP] = 0;
- }
- }
- else if (texImage->_BaseFormat == GL_LUMINANCE) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba_uint[col][GCOMP] = 0;
- rgba_uint[col][BCOMP] = 0;
- rgba_uint[col][ACOMP] = 1;
- }
- }
- else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba_uint[col][GCOMP] = 0;
- rgba_uint[col][BCOMP] = 0;
- }
- }
- else if (texImage->_BaseFormat == GL_INTENSITY) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba_uint[col][GCOMP] = 0;
- rgba_uint[col][BCOMP] = 0;
- rgba_uint[col][ACOMP] = 1;
- }
- }
-
+ _mesa_rebase_rgba_uint(width, rgba_uint, texImage->_BaseFormat);
_mesa_pack_rgba_span_int(ctx, width, rgba_uint,
format, type, dest);
} else {
_mesa_unpack_rgba_row(texFormat, width, src, rgba);
-
- if (texImage->_BaseFormat == GL_ALPHA) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba[col][RCOMP] = 0.0F;
- rgba[col][GCOMP] = 0.0F;
- rgba[col][BCOMP] = 0.0F;
- }
- }
- else if (texImage->_BaseFormat == GL_LUMINANCE) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba[col][GCOMP] = 0.0F;
- rgba[col][BCOMP] = 0.0F;
- rgba[col][ACOMP] = 1.0F;
- }
- }
- else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba[col][GCOMP] = 0.0F;
- rgba[col][BCOMP] = 0.0F;
- }
- }
- else if (texImage->_BaseFormat == GL_INTENSITY) {
- GLuint col;
- for (col = 0; col < width; col++) {
- rgba[col][GCOMP] = 0.0F;
- rgba[col][BCOMP] = 0.0F;
- rgba[col][ACOMP] = 1.0F;
- }
- }
-
+ _mesa_rebase_rgba_float(width, rgba, texImage->_BaseFormat);
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
format, type, dest,
&ctx->Pack, transferOps);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 06:41:47 +0000