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glsl: Fix condition to generate shader link error

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GL_ARB_ES2_compatibility doesn't say anything about shader linking
when one of the shaders (vertex or fragment shader) is absent. So,
the extension shouldn't change the behavior specified in GLSL
specification.

Tested the behavior on proprietary linux drivers of NVIDIA and AMD.
Both of them allow linking a version 100 shader program in OpenGL
context, when one of the shaders is absent.

Makes following Khronos CTS tests to pass:
successfulcompilevert_linkprogram.test
successfulcompilefrag_linkprogram.test

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
(cherry picked from commit 03597cf802)
This commit is contained in:
Anuj Phogat 2013-12-19 14:17:19 -08:00 • committed by Carl Worth
parent 00d1daf2a8
commit c074e34745
1 changed files with 5 additions and 4 deletions
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9
src/glsl/linker.cpp
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@ -2373,11 +2373,12 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
goto done;
/* OpenGL ES requires that a vertex shader and a fragment shader both be
* present in a linked program. By checking prog->IsES, we also
* catch the GL_ARB_ES2_compatibility case.
* present in a linked program. GL_ARB_ES2_compatibility doesn't say
* anything about shader linking when one of the shaders (vertex or
* fragment shader) is absent. So, the extension shouldn't change the
* behavior specified in GLSL specification.
*/
if (!prog->InternalSeparateShader &&
(ctx->API == API_OPENGLES2 || prog->IsES)) {
if (!prog->InternalSeparateShader && ctx->API == API_OPENGLES2) {
if (prog->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
linker_error(prog, "program lacks a vertex shader\n");
} else if (prog->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL) {