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authormarha <marha@users.sourceforge.net>2012-03-23 10:05:55 +0100
committermarha <marha@users.sourceforge.net>2012-03-23 10:05:55 +0100
commit0f834b91a4768673833ab4917e87d86c237bb1a6 (patch)
tree363489504ed4b2d360259b8de4c9e392918e5d02 /mesalib/src/glsl/linker.cpp
parentfc72edebf875378459368c5383d9023730cbca54 (diff)
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libX11 xserver fontconfig mesa pixman xkbcomp xkeyboard-config git update
23 Mar 2012
Diffstat (limited to 'mesalib/src/glsl/linker.cpp')
-rw-r--r--mesalib/src/glsl/linker.cpp41
1 files changed, 34 insertions, 7 deletions
diff --git a/mesalib/src/glsl/linker.cpp b/mesalib/src/glsl/linker.cpp
index 82bddb003..8278e43ad 100644
--- a/mesalib/src/glsl/linker.cpp
+++ b/mesalib/src/glsl/linker.cpp
@@ -258,11 +258,36 @@ validate_vertex_shader_executable(struct gl_shader_program *prog,
if (shader == NULL)
return true;
- find_assignment_visitor find("gl_Position");
- find.run(shader->ir);
- if (!find.variable_found()) {
- linker_error(prog, "vertex shader does not write to `gl_Position'\n");
- return false;
+ /* From the GLSL 1.10 spec, page 48:
+ *
+ * "The variable gl_Position is available only in the vertex
+ * language and is intended for writing the homogeneous vertex
+ * position. All executions of a well-formed vertex shader
+ * executable must write a value into this variable. [...] The
+ * variable gl_Position is available only in the vertex
+ * language and is intended for writing the homogeneous vertex
+ * position. All executions of a well-formed vertex shader
+ * executable must write a value into this variable."
+ *
+ * while in GLSL 1.40 this text is changed to:
+ *
+ * "The variable gl_Position is available only in the vertex
+ * language and is intended for writing the homogeneous vertex
+ * position. It can be written at any time during shader
+ * execution. It may also be read back by a vertex shader
+ * after being written. This value will be used by primitive
+ * assembly, clipping, culling, and other fixed functionality
+ * operations, if present, that operate on primitives after
+ * vertex processing has occurred. Its value is undefined if
+ * the vertex shader executable does not write gl_Position."
+ */
+ if (prog->Version < 140) {
+ find_assignment_visitor find("gl_Position");
+ find.run(shader->ir);
+ if (!find.variable_found()) {
+ linker_error(prog, "vertex shader does not write to `gl_Position'\n");
+ return false;
+ }
}
prog->Vert.ClipDistanceArraySize = 0;
@@ -2175,7 +2200,7 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
* of all shaders must match.
*/
assert(min_version >= 100);
- assert(max_version <= 130);
+ assert(max_version <= 140);
if ((max_version >= 130 || min_version == 100)
&& min_version != max_version) {
linker_error(prog, "all shaders must use same shading "
@@ -2269,7 +2294,9 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
if (ctx->ShaderCompilerOptions[i].LowerClipDistance)
lower_clip_distance(prog->_LinkedShaders[i]->ir);
- while (do_common_optimization(prog->_LinkedShaders[i]->ir, true, false, 32))
+ unsigned max_unroll = ctx->ShaderCompilerOptions[i].MaxUnrollIterations;
+
+ while (do_common_optimization(prog->_LinkedShaders[i]->ir, true, false, max_unroll))
;
}