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-rw-r--r--src/mesa/main/image.c19
-rw-r--r--src/mesa/main/mtypes.h1
-rw-r--r--src/mesa/main/texstore.c2
3 files changed, 16 insertions, 6 deletions
diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c
index fc8e1f0f57..eb91ebb611 100644
--- a/src/mesa/main/image.c
+++ b/src/mesa/main/image.c
@@ -1182,15 +1182,24 @@ _mesa_pack_rgba_span_float(GLcontext *ctx, GLuint n, GLfloat rgba[][4],
if (dstFormat == GL_LUMINANCE || dstFormat == GL_LUMINANCE_ALPHA) {
/* compute luminance values */
- if (dstType != GL_FLOAT || ctx->Color.ClampReadColor == GL_TRUE) {
+ if (transferOps & IMAGE_RED_TO_LUMINANCE) {
+ /* Luminance = Red (glGetTexImage) */
for (i = 0; i < n; i++) {
- GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
- luminance[i] = CLAMP(sum, 0.0F, 1.0F);
+ luminance[i] = rgba[i][RCOMP];
}
}
else {
- for (i = 0; i < n; i++) {
- luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ /* Luminance = Red + Green + Blue (glReadPixels) */
+ if (dstType != GL_FLOAT || ctx->Color.ClampReadColor == GL_TRUE) {
+ for (i = 0; i < n; i++) {
+ GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ luminance[i] = CLAMP(sum, 0.0F, 1.0F);
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ }
}
}
}
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 422d176c25..7caa1f8d7f 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2540,6 +2540,7 @@ struct matrix_stack
#define IMAGE_HISTOGRAM_BIT 0x200
#define IMAGE_MIN_MAX_BIT 0x400
#define IMAGE_CLAMP_BIT 0x800 /* extra */
+#define IMAGE_RED_TO_LUMINANCE 0x1000
/** Pixel Transfer ops up to convolution */
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 87f8fa7a0d..994fb16730 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -3611,7 +3611,7 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
}
_mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
format, type, dest,
- &ctx->Pack, 0x0 /*image xfer ops*/);
+ &ctx->Pack, IMAGE_RED_TO_LUMINANCE);
} /* format */
} /* row */
} /* img */