diff options
| -rw-r--r-- | src/mesa/shader/slang/slang_link.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/mesa/shader/slang/slang_link.c b/src/mesa/shader/slang/slang_link.c index 99f2cbdcc05..152e97a668d 100644 --- a/src/mesa/shader/slang/slang_link.c +++ b/src/mesa/shader/slang/slang_link.c @@ -495,8 +495,33 @@ _slang_update_inputs_outputs(struct gl_program *prog) maxAddrReg = MAX2(maxAddrReg, (GLuint) (inst->SrcReg[j].Index + 1)); } } + if (inst->DstReg.File == PROGRAM_OUTPUT) { prog->OutputsWritten |= 1 << inst->DstReg.Index; + if (inst->DstReg.RelAddr) { + /* If the output attribute is indexed with relative addressing + * we know that it must be a varying or texcoord such as + * gl_TexCoord[i] = v; In this case, mark all the texcoords + * or varying outputs as being written. It's not an error if + * a vertex shader writes varying vars that aren't used by the + * fragment shader. But it is an error for a fragment shader + * to use varyings that are not written by the vertex shader. + */ + if (prog->Target == GL_VERTEX_PROGRAM_ARB) { + if (inst->DstReg.Index == VERT_RESULT_TEX0) { + /* mark all texcoord outputs as written */ + const GLbitfield mask = + ((1 << MAX_TEXTURE_COORD_UNITS) - 1) << VERT_RESULT_TEX0; + prog->OutputsWritten |= mask; + } + else if (inst->DstReg.Index == VERT_RESULT_VAR0) { + /* mark all generic varying outputs as written */ + const GLbitfield mask = + ((1 << MAX_VARYING) - 1) << VERT_RESULT_VAR0; + prog->OutputsWritten |= mask; + } + } + } } else if (inst->DstReg.File == PROGRAM_ADDRESS) { maxAddrReg = MAX2(maxAddrReg, inst->DstReg.Index + 1); |