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meta: Avoid null access on setup_glsl_msaa_blit_shader() 

On default fallback path there was null access on src_rb

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Juha-Pekka Heikkila 2014-09-08 13:50:08 +03:00 committed by Tapani Pälli
parent ba089cfa82
commit e13a8dc37d
1 changed files with 14 additions and 12 deletions
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26
src/mesa/drivers/common/meta_blit.c
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@ -70,9 +70,20 @@ setup_glsl_msaa_blit_shader(struct gl_context *ctx,
const char *sampler_array_suffix = "";
char *name;
const char *texcoord_type = "vec2";
const int samples = MAX2(src_rb->NumSamples, 1);
int samples;
int shader_offset = 0;
if (src_rb) {
samples = MAX2(src_rb->NumSamples, 1);
src_datatype = _mesa_get_format_datatype(src_rb->Format);
} else {
/* depth-or-color glCopyTexImage fallback path that passes a NULL rb and
* doesn't handle integer.
*/
samples = 1;
src_datatype = GL_UNSIGNED_NORMALIZED;
}
/* We expect only power of 2 samples in source multisample buffer. */
assert((samples & (samples - 1)) == 0);
while (samples >> (shader_offset + 1)) {
@ -81,15 +92,6 @@ setup_glsl_msaa_blit_shader(struct gl_context *ctx,
/* Update the assert if we plan to support more than 16X MSAA. */
assert(shader_offset >= 0 && shader_offset <= 4);
if (src_rb) {
src_datatype = _mesa_get_format_datatype(src_rb->Format);
} else {
/* depth-or-color glCopyTexImage fallback path that passes a NULL rb and
* doesn't handle integer.
*/
src_datatype = GL_UNSIGNED_NORMALIZED;
}
if (ctx->DrawBuffer->Visual.samples > 1) {
/* If you're calling meta_BlitFramebuffer with the destination
* multisampled, this is the only path that will work -- swrast and
@ -108,8 +110,8 @@ setup_glsl_msaa_blit_shader(struct gl_context *ctx,
switch (target) {
case GL_TEXTURE_2D_MULTISAMPLE:
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
if (src_rb->_BaseFormat == GL_DEPTH_COMPONENT ||
src_rb->_BaseFormat == GL_DEPTH_STENCIL) {
if (src_rb && (src_rb->_BaseFormat == GL_DEPTH_COMPONENT ||
src_rb->_BaseFormat == GL_DEPTH_STENCIL)) {
if (dst_is_msaa)
shader_index = BLIT_MSAA_SHADER_2D_MULTISAMPLE_DEPTH_COPY;
else