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authorBrian <brian.paul@tungstengraphics.com>2007-08-16 17:32:24 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-08-16 17:32:24 -0600
commit78d6d5e8fe7281f67b7ce8d9911e4f280435b1f5 (patch)
tree1e7945f1db0c03e58ccf9491aeeb515b012b81a4
parent9ba4311e71f510797e1b446ab7dc6b6d4dc55dd5 (diff)
make pass-through vertex shader
-rw-r--r--src/mesa/state_tracker/st_cb_clear.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index 3777c53d48..492073e840 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -152,8 +152,62 @@ make_color_shader(struct st_context *st)
/**
+ * Create a simple vertex shader that just passes through the
+ * vertex position and color.
+ */
+static struct st_vertex_program *
+make_vertex_shader(struct st_context *st)
+{
+ GLcontext *ctx = st->ctx;
+ struct st_vertex_program *stvp;
+ struct gl_program *p;
+ GLboolean b;
+
+ p = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
+ if (!p)
+ return NULL;
+
+ p->NumInstructions = 3;
+ p->Instructions = _mesa_alloc_instructions(3);
+ if (!p->Instructions) {
+ ctx->Driver.DeleteProgram(ctx, p);
+ return NULL;
+ }
+ _mesa_init_instructions(p->Instructions, 3);
+ /* MOV result.pos, vertex.pos; */
+ p->Instructions[0].Opcode = OPCODE_MOV;
+ p->Instructions[0].DstReg.File = PROGRAM_OUTPUT;
+ p->Instructions[0].DstReg.Index = VERT_RESULT_HPOS;
+ p->Instructions[0].SrcReg[0].File = PROGRAM_INPUT;
+ p->Instructions[0].SrcReg[0].Index = VERT_ATTRIB_POS;
+ /* MOV result.color, vertex.color; */
+ p->Instructions[1].Opcode = OPCODE_MOV;
+ p->Instructions[1].DstReg.File = PROGRAM_OUTPUT;
+ p->Instructions[1].DstReg.Index = VERT_RESULT_COL0;
+ p->Instructions[1].SrcReg[0].File = PROGRAM_INPUT;
+ p->Instructions[1].SrcReg[0].Index = VERT_ATTRIB_COLOR0;
+ /* END; */
+ p->Instructions[2].Opcode = OPCODE_END;
+
+ p->InputsRead = VERT_BIT_POS | VERT_BIT_COLOR0;
+ p->OutputsWritten = ((1 << VERT_RESULT_COL0) |
+ (1 << VERT_RESULT_HPOS));
+
+ stvp = (struct st_vertex_program *) p;
+ /* compile into tgsi format */
+ b = tgsi_mesa_compile_vp_program(&stvp->Base,
+ stvp->tokens, ST_FP_MAX_TOKENS);
+ assert(b);
+
+ return stvp;
+}
+
+
+
+/**
* Draw a screen-aligned quadrilateral.
* Coords are window coords.
+ * XXX need to emit clip coords when using a vertex program!
*/
static void
draw_quad(GLcontext *ctx,