diff options
Diffstat (limited to 'src/glsl/linker.cpp')
| -rw-r--r-- | src/glsl/linker.cpp | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp index 85830e680ed..118614bdd80 100644 --- a/src/glsl/linker.cpp +++ b/src/glsl/linker.cpp @@ -2726,10 +2726,18 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog) goto done; } - unsigned first; - for (first = 0; first <= MESA_SHADER_FRAGMENT; first++) { - if (prog->_LinkedShaders[first] != NULL) - break; + unsigned first, last; + + first = MESA_SHADER_STAGES; + last = 0; + + /* Determine first and last stage. */ + for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) { + if (!prog->_LinkedShaders[i]) + continue; + if (first == MESA_SHADER_STAGES) + first = i; + last = i; } if (num_tfeedback_decls != 0) { @@ -2758,13 +2766,9 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog) * ensures that inter-shader outputs written to in an earlier stage are * eliminated if they are (transitively) not used in a later stage. */ - int last, next; - for (last = MESA_SHADER_FRAGMENT; last >= 0; last--) { - if (prog->_LinkedShaders[last] != NULL) - break; - } + int next; - if (last >= 0 && last < MESA_SHADER_FRAGMENT) { + if (first < MESA_SHADER_FRAGMENT) { gl_shader *const sh = prog->_LinkedShaders[last]; if (first == MESA_SHADER_GEOMETRY) { @@ -2776,13 +2780,14 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog) * MESA_SHADER_GEOMETRY. */ if (!assign_varying_locations(ctx, mem_ctx, prog, - NULL, sh, + NULL, prog->_LinkedShaders[first], num_tfeedback_decls, tfeedback_decls, prog->Geom.VerticesIn)) goto done; } - if (num_tfeedback_decls != 0 || prog->SeparateShader) { + if (last != MESA_SHADER_FRAGMENT && + (num_tfeedback_decls != 0 || prog->SeparateShader)) { /* There was no fragment shader, but we still have to assign varying * locations for use by transform feedback. */ |