draw_pipe_aapoint.c File Reference

Include dependency graph for draw_pipe_aapoint.c:

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Data Structures
struct	aapoint_fragment_shader
	Subclass of pipe_shader_state to carry extra fragment shader info. More...
struct	aapoint_stage
	Subclass of draw_stage. More...
struct	aa_transform_context
	Subclass of tgsi_transform_context, used for transforming the user's fragment shader to add the special AA instructions. More...
Defines
#define	NORMALIZE   0
	AA point stage: AA points are converted to quads and rendered with a special fragment shader.
#define	MAX   1000
Functions
static void	aa_transform_decl (struct tgsi_transform_context *ctx, struct tgsi_full_declaration *decl)
	TGSI declaration transform callback.
static void	aa_transform_inst (struct tgsi_transform_context *ctx, struct tgsi_full_instruction *inst)
	TGSI instruction transform callback.
static boolean	generate_aapoint_fs (struct aapoint_stage *aapoint)
	Generate the frag shader we'll use for drawing AA points.
static boolean	bind_aapoint_fragment_shader (struct aapoint_stage *aapoint)
	When we're about to draw our first AA point in a batch, this function is called to tell the driver to bind our modified fragment shader.
static struct aapoint_stage *	aapoint_stage (struct draw_stage *stage)
static void	aapoint_point (struct draw_stage *stage, struct prim_header *header)
	Draw an AA point by drawing a quad.
static void	aapoint_first_point (struct draw_stage *stage, struct prim_header *header)
static void	aapoint_flush (struct draw_stage *stage, unsigned flags)
static void	aapoint_reset_stipple_counter (struct draw_stage *stage)
static void	aapoint_destroy (struct draw_stage *stage)
static struct aapoint_stage *	draw_aapoint_stage (struct draw_context *draw)
static struct aapoint_stage *	aapoint_stage_from_pipe (struct pipe_context *pipe)
static void *	aapoint_create_fs_state (struct pipe_context *pipe, const struct pipe_shader_state *fs)
	This function overrides the driver's create_fs_state() function and will typically be called by the state tracker.
static void	aapoint_bind_fs_state (struct pipe_context *pipe, void *fs)
static void	aapoint_delete_fs_state (struct pipe_context *pipe, void *fs)
boolean	draw_install_aapoint_stage (struct draw_context *draw, struct pipe_context *pipe)
	Called by drivers that want to install this AA point prim stage into the draw module's pipeline.

---

Define Documentation

#define MAX   1000

#define NORMALIZE   0

AA point stage: AA points are converted to quads and rendered with a special fragment shader.

Another approach would be to use a texture map image of a point, but experiments indicate the quality isn't nearly as good as this approach.

Note: this looks a lot like draw_aaline.c but there's actually little if any code that can be shared.

Authors: Brian Paul

Definition at line 63 of file draw_pipe_aapoint.c.

---

Function Documentation

static void aa_transform_decl	(	struct tgsi_transform_context *	ctx,
		struct tgsi_full_declaration *	decl
	)			[static]

TGSI declaration transform callback.

Look for two free temp regs and available input reg for new texcoords.

Definition at line 129 of file draw_pipe_aapoint.c.

References aa_transform_context::colorOutput, tgsi_full_declaration::Declaration, tgsi_full_declaration::DeclarationRange, tgsi_transform_context::emit_declaration, tgsi_declaration::File, tgsi_declaration_range::First, tgsi_declaration_range::Last, aa_transform_context::maxGeneric, aa_transform_context::maxInput, tgsi_full_declaration::Semantic, tgsi_declaration_semantic::SemanticIndex, tgsi_declaration_semantic::SemanticName, aa_transform_context::tempsUsed, TGSI_FILE_INPUT, TGSI_FILE_OUTPUT, TGSI_FILE_TEMPORARY, TGSI_SEMANTIC_COLOR, and TGSI_SEMANTIC_GENERIC.

{
   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;

   if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
       decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
       decl->Semantic.SemanticIndex == 0) {
      aactx->colorOutput = decl->DeclarationRange.First;
   }
   else if (decl->Declaration.File == TGSI_FILE_INPUT) {
      if ((int) decl->DeclarationRange.Last > aactx->maxInput)
         aactx->maxInput = decl->DeclarationRange.Last;
      if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
           (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
         aactx->maxGeneric = decl->Semantic.SemanticIndex;
      }
   }
   else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
      uint i;
      for (i = decl->DeclarationRange.First;
           i <= decl->DeclarationRange.Last; i++) {
         aactx->tempsUsed |= (1 << i);
      }
   }

   ctx->emit_declaration(ctx, decl);
}

static void aa_transform_inst	(	struct tgsi_transform_context *	ctx,
		struct tgsi_full_instruction *	inst
	)			[static]

TGSI instruction transform callback.

Replace writes to result.color w/ a temp reg. Upon END instruction, insert texture sampling code for antialiasing.

Definition at line 165 of file draw_pipe_aapoint.c.

References assert, aa_transform_context::colorOutput, aa_transform_context::colorTemp, tgsi_full_declaration::Declaration, tgsi_full_declaration::DeclarationRange, tgsi_full_dst_register::DstRegister, tgsi_transform_context::emit_declaration, tgsi_transform_context::emit_instruction, FALSE, tgsi_src_register::File, tgsi_dst_register::File, tgsi_declaration::File, tgsi_declaration_range::First, aa_transform_context::firstInstruction, tgsi_full_instruction::FullDstRegisters, tgsi_full_instruction::FullSrcRegisters, tgsi_src_register::Index, tgsi_dst_register::Index, tgsi_full_instruction::Instruction, tgsi_declaration::Interpolate, tgsi_declaration_range::Last, aa_transform_context::maxGeneric, aa_transform_context::maxInput, tgsi_src_register::Negate, tgsi_instruction::NumDstRegs, tgsi_instruction::NumSrcRegs, tgsi_instruction::Opcode, tgsi_full_declaration::Semantic, tgsi_declaration::Semantic, tgsi_declaration_semantic::SemanticIndex, tgsi_declaration_semantic::SemanticName, tgsi_full_src_register::SrcRegister, tgsi_src_register::SwizzleW, tgsi_src_register::SwizzleX, tgsi_src_register::SwizzleY, tgsi_src_register::SwizzleZ, aa_transform_context::tempsUsed, tgsi_default_full_declaration(), tgsi_default_full_instruction(), TGSI_FILE_INPUT, TGSI_FILE_OUTPUT, TGSI_FILE_TEMPORARY, TGSI_INTERPOLATE_PERSPECTIVE, TGSI_OPCODE_ADD, TGSI_OPCODE_CMP, TGSI_OPCODE_END, TGSI_OPCODE_KIL, TGSI_OPCODE_MOV, TGSI_OPCODE_MUL, TGSI_OPCODE_RCP, TGSI_OPCODE_RSQ, TGSI_OPCODE_SGT, TGSI_OPCODE_SLE, TGSI_OPCODE_SUB, TGSI_SEMANTIC_GENERIC, TGSI_SWIZZLE_W, TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z, TGSI_WRITEMASK_W, TGSI_WRITEMASK_X, TGSI_WRITEMASK_XY, TGSI_WRITEMASK_XYZ, TGSI_WRITEMASK_Y, TGSI_WRITEMASK_Z, aa_transform_context::tmp0, and tgsi_dst_register::WriteMask.

{
   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
   struct tgsi_full_instruction newInst;

   if (aactx->firstInstruction) {
      /* emit our new declarations before the first instruction */

      struct tgsi_full_declaration decl;
      const int texInput = aactx->maxInput + 1;
      int tmp0;
      uint i;

      /* find two free temp regs */
      for (i = 0; i < 32; i++) {
         if ((aactx->tempsUsed & (1 << i)) == 0) {
            /* found a free temp */
            if (aactx->tmp0 < 0)
               aactx->tmp0 = i;
            else if (aactx->colorTemp < 0)
               aactx->colorTemp = i;
            else
               break;
         }
      }

      assert(aactx->colorTemp != aactx->tmp0);

      tmp0 = aactx->tmp0;

      /* declare new generic input/texcoord */
      decl = tgsi_default_full_declaration();
      decl.Declaration.File = TGSI_FILE_INPUT;
      /* XXX this could be linear... */
      decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
      decl.Declaration.Semantic = 1;
      decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
      decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
      decl.DeclarationRange.First = 
      decl.DeclarationRange.Last = texInput;
      ctx->emit_declaration(ctx, &decl);

      /* declare new temp regs */
      decl = tgsi_default_full_declaration();
      decl.Declaration.File = TGSI_FILE_TEMPORARY;
      decl.DeclarationRange.First = 
      decl.DeclarationRange.Last = tmp0;
      ctx->emit_declaration(ctx, &decl);

      decl = tgsi_default_full_declaration();
      decl.Declaration.File = TGSI_FILE_TEMPORARY;
      decl.DeclarationRange.First = 
      decl.DeclarationRange.Last = aactx->colorTemp;
      ctx->emit_declaration(ctx, &decl);

      aactx->firstInstruction = FALSE;


      /*
       * Emit code to compute fragment coverage, kill if outside point radius
       *
       * Temp reg0 usage:
       *  t0.x = distance of fragment from center point
       *  t0.y = boolean, is t0.x > 1.0, also misc temp usage
       *  t0.z = temporary for computing 1/(1-k) value
       *  t0.w = final coverage value
       */

      /* MUL t0.xy, tex, tex;  # compute x^2, y^2 */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XY;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[0].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[1].SrcRegister.Index = texInput;
      ctx->emit_instruction(ctx, &newInst);

      /* ADD t0.x, t0.x, t0.y;  # x^2 + y^2 */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_ADD;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_X;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleX = TGSI_SWIZZLE_X;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[1].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleX = TGSI_SWIZZLE_Y;
      ctx->emit_instruction(ctx, &newInst);

#if NORMALIZE  /* OPTIONAL normalization of length */
      /* RSQ t0.x, t0.x; */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_RSQ;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_X;
      newInst.Instruction.NumSrcRegs = 1;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      ctx->emit_instruction(ctx, &newInst);

      /* RCP t0.x, t0.x; */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_RCP;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_X;
      newInst.Instruction.NumSrcRegs = 1;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      ctx->emit_instruction(ctx, &newInst);
#endif

      /* SGT t0.y, t0.xxxx, t0.wwww;  # bool b = d > 1 (NOTE t0.w == 1) */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_SGT;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_Y;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleY = TGSI_SWIZZLE_X;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[1].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleY = TGSI_SWIZZLE_W;
      ctx->emit_instruction(ctx, &newInst);

      /* KIL -tmp0.yyyy;   # if -tmp0.y < 0, KILL */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_KIL;
      newInst.Instruction.NumDstRegs = 0;
      newInst.Instruction.NumSrcRegs = 1;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleX = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleY = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleZ = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleW = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.Negate = 1;
      ctx->emit_instruction(ctx, &newInst);


      /* compute coverage factor = (1-d)/(1-k) */

      /* SUB t0.z, tex.w, tex.z;  # m = 1 - k */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_SUB;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_Z;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[0].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleZ = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[1].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleZ = TGSI_SWIZZLE_Z;
      ctx->emit_instruction(ctx, &newInst);

      /* RCP t0.z, t0.z;  # t0.z = 1 / m */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_RCP;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_Z;
      newInst.Instruction.NumSrcRegs = 1;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleX = TGSI_SWIZZLE_Z;
      ctx->emit_instruction(ctx, &newInst);

      /* SUB t0.y, 1, t0.x;  # d = 1 - d */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_SUB;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_Y;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[0].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleY = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[1].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleY = TGSI_SWIZZLE_X;
      ctx->emit_instruction(ctx, &newInst);

      /* MUL t0.w, t0.y, t0.z;   # coverage = d * m */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleW = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[1].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleW = TGSI_SWIZZLE_Z;
      ctx->emit_instruction(ctx, &newInst);

      /* SLE t0.y, t0.x, tex.z;  # bool b = distance <= k */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_SLE;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_Y;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleY = TGSI_SWIZZLE_X;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[1].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleY = TGSI_SWIZZLE_Z;
      ctx->emit_instruction(ctx, &newInst);

      /* CMP t0.w, -t0.y, tex.w, t0.w;
       *  # if -t0.y < 0 then
       *       t0.w = 1
       *    else
       *       t0.w = t0.w
       */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_CMP;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullDstRegisters[0].DstRegister.Index = tmp0;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
      newInst.Instruction.NumSrcRegs = 3;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleX = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleY = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleZ = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.SwizzleW = TGSI_SWIZZLE_Y;
      newInst.FullSrcRegisters[0].SrcRegister.Negate = 1;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_INPUT;
      newInst.FullSrcRegisters[1].SrcRegister.Index = texInput;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleX = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleY = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleZ = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[1].SrcRegister.SwizzleW = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[2].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[2].SrcRegister.Index = tmp0;
      newInst.FullSrcRegisters[2].SrcRegister.SwizzleX = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[2].SrcRegister.SwizzleY = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[2].SrcRegister.SwizzleZ = TGSI_SWIZZLE_W;
      newInst.FullSrcRegisters[2].SrcRegister.SwizzleW = TGSI_SWIZZLE_W;
      ctx->emit_instruction(ctx, &newInst);

   }

   if (inst->Instruction.Opcode == TGSI_OPCODE_END) {
      /* add alpha modulation code at tail of program */

      /* MOV result.color.xyz, colorTemp; */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
      newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
      newInst.Instruction.NumSrcRegs = 1;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
      ctx->emit_instruction(ctx, &newInst);

      /* MUL result.color.w, colorTemp, tmp0.w; */
      newInst = tgsi_default_full_instruction();
      newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
      newInst.Instruction.NumDstRegs = 1;
      newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
      newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
      newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
      newInst.Instruction.NumSrcRegs = 2;
      newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
      newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
      newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->tmp0;
      ctx->emit_instruction(ctx, &newInst);
   }
   else {
      /* Not an END instruction.
       * Look for writes to result.color and replace with colorTemp reg.
       */
      uint i;

      for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
         struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
         if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
             dst->DstRegister.Index == aactx->colorOutput) {
            dst->DstRegister.File = TGSI_FILE_TEMPORARY;
            dst->DstRegister.Index = aactx->colorTemp;
         }
      }
   }

   ctx->emit_instruction(ctx, inst);
}

static void aapoint_bind_fs_state	(	struct pipe_context *	pipe,
		void *	fs
	)			[static]

Definition at line 810 of file draw_pipe_aapoint.c.

References aapoint_stage_from_pipe(), aapoint_stage::driver_bind_fs_state, aapoint_fragment_shader::driver_fs, aapoint_stage::fs, and aapoint_stage::pipe.

{
   struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe);
   struct aapoint_fragment_shader *aafs = (struct aapoint_fragment_shader *) fs;
   /* save current */
   aapoint->fs = aafs;
   /* pass-through */
   aapoint->driver_bind_fs_state(aapoint->pipe,
                                 (aafs ? aafs->driver_fs : NULL));

static void* aapoint_create_fs_state	(	struct pipe_context *	pipe,
		const struct pipe_shader_state *	fs
	)			[static]

This function overrides the driver's create_fs_state() function and will typically be called by the state tracker.

Definition at line 792 of file draw_pipe_aapoint.c.

References aapoint_stage_from_pipe(), CALLOC_STRUCT, aapoint_stage::driver_create_fs_state, aapoint_fragment_shader::driver_fs, aapoint_stage::pipe, and aapoint_fragment_shader::state.

{
   struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe);
   struct aapoint_fragment_shader *aafs = CALLOC_STRUCT(aapoint_fragment_shader);
   if (aafs == NULL) 
      return NULL;

   aafs->state = *fs;

   /* pass-through */
   aafs->driver_fs = aapoint->driver_create_fs_state(aapoint->pipe, fs);

   return aafs;

static void aapoint_delete_fs_state	(	struct pipe_context *	pipe,
		void *	fs
	)			[static]

Definition at line 823 of file draw_pipe_aapoint.c.

References aapoint_stage_from_pipe(), aapoint_stage::driver_delete_fs_state, aapoint_fragment_shader::driver_fs, FREE, and aapoint_stage::pipe.

{
   struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe);
   struct aapoint_fragment_shader *aafs = (struct aapoint_fragment_shader *) fs;
   /* pass-through */
   aapoint->driver_delete_fs_state(aapoint->pipe, aafs->driver_fs);
   FREE(aafs);

static void aapoint_destroy

(

struct draw_stage *

stage

)

[static]

Definition at line 742 of file draw_pipe_aapoint.c.

References draw_free_temp_verts(), and FREE.

{
   draw_free_temp_verts( stage );
   FREE( stage );

static void aapoint_first_point	(	struct draw_stage *	stage,
		struct prim_header *	header
	)			[static]

Definition at line 668 of file draw_pipe_aapoint.c.

References aapoint_point(), aapoint_stage(), assert, bind_aapoint_fragment_shader(), draw_stage::draw, draw, draw_context::extra_vp_outputs, aapoint_stage::fs, aapoint_fragment_shader::generic_attrib, draw_vertex_shader::info, tgsi_shader_info::num_outputs, draw_context::num_vs_outputs, tgsi_shader_info::output_semantic_name, draw_stage::point, pipe_rasterizer_state::point_size, pipe_rasterizer_state::point_size_per_vertex, pipe_rasterizer_state::point_smooth, aapoint_stage::pos_slot, draw_context::position_output, aapoint_stage::psize_slot, aapoint_stage::radius, draw_context::rasterizer, draw_context::semantic_index, draw_context::semantic_name, draw_context::slot, aapoint_stage::tex_slot, TGSI_SEMANTIC_GENERIC, TGSI_SEMANTIC_PSIZE, draw_context::vertex_shader, and draw_context::vs.

{
   auto struct aapoint_stage *aapoint = aapoint_stage(stage);
   struct draw_context *draw = stage->draw;

   assert(draw->rasterizer->point_smooth);

   if (draw->rasterizer->point_size <= 2.0)
      aapoint->radius = 1.0;
   else
      aapoint->radius = 0.5f * draw->rasterizer->point_size;

   /*
    * Bind (generate) our fragprog.
    */
   bind_aapoint_fragment_shader(aapoint);

   /* update vertex attrib info */
   aapoint->tex_slot = draw->vs.num_vs_outputs;
   assert(aapoint->tex_slot > 0); /* output[0] is vertex pos */

   aapoint->pos_slot = draw->vs.position_output;

   draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
   draw->extra_vp_outputs.semantic_index = aapoint->fs->generic_attrib;
   draw->extra_vp_outputs.slot = aapoint->tex_slot;

   /* find psize slot in post-transform vertex */
   aapoint->psize_slot = -1;
   if (draw->rasterizer->point_size_per_vertex) {
      /* find PSIZ vertex output */
      const struct draw_vertex_shader *vs = draw->vs.vertex_shader;
      uint i;
      for (i = 0; i < vs->info.num_outputs; i++) {
         if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) {
            aapoint->psize_slot = i;
            break;
         }
      }
   }

   /* now really draw first point */
   stage->point = aapoint_point;
   stage->point(stage, header);

static void aapoint_flush	(	struct draw_stage *	stage,
		unsigned	flags
	)			[static]

Definition at line 716 of file draw_pipe_aapoint.c.

References aapoint_first_point(), aapoint_stage(), draw_stage::draw, draw, aapoint_stage::driver_bind_fs_state, aapoint_fragment_shader::driver_fs, draw_context::extra_vp_outputs, FALSE, draw_stage::flush, aapoint_stage::fs, draw_stage::next, aapoint_stage::pipe, draw_stage::point, draw_context::slot, draw_context::suspend_flushing, and TRUE.

{
   struct draw_context *draw = stage->draw;
   struct aapoint_stage *aapoint = aapoint_stage(stage);
   struct pipe_context *pipe = aapoint->pipe;

   stage->point = aapoint_first_point;
   stage->next->flush( stage->next, flags );

   /* restore original frag shader */
   draw->suspend_flushing = TRUE;
   aapoint->driver_bind_fs_state(pipe, aapoint->fs->driver_fs);
   draw->suspend_flushing = FALSE;

   draw->extra_vp_outputs.slot = 0;

static void aapoint_point	(	struct draw_stage *	stage,
		struct prim_header *	header
	)			[static]

Draw an AA point by drawing a quad.

Definition at line 570 of file draw_pipe_aapoint.c.

References aapoint_stage(), ASSIGN_4V, vertex_header::data, dup_vert(), draw_stage::next, aapoint_stage::pos_slot, aapoint_stage::psize_slot, aapoint_stage::radius, aapoint_stage::tex_slot, draw_stage::tri, and prim_header::v.

{
   const struct aapoint_stage *aapoint = aapoint_stage(stage);
   struct prim_header tri;
   struct vertex_header *v[4];
   uint texPos = aapoint->tex_slot;
   uint pos_slot = aapoint->pos_slot;
   float radius, *pos, *tex;
   uint i;
   float k;

   if (aapoint->psize_slot >= 0) {
      radius = 0.5f * header->v[0]->data[aapoint->psize_slot][0];
   }
   else {
      radius = aapoint->radius;
   }

   /*
    * Note: the texcoords (generic attrib, really) we use are special:
    * The S and T components simply vary from -1 to +1.
    * The R component is k, below.
    * The Q component is 1.0 and will used as a handy constant in the
    * fragment shader.
    */

   /*
    * k is the threshold distance from the point's center at which
    * we begin alpha attenuation (the coverage value).
    * Operating within a unit circle, we'll compute the fragment's
    * distance 'd' from the center point using the texcoords.
    * IF d > 1.0 THEN
    *    KILL fragment
    * ELSE IF d > k THEN
    *    compute coverage in [0,1] proportional to d in [k, 1].
    * ELSE
    *    coverage = 1.0;  // full coverage
    * ENDIF
    *
    * Note: the ELSEIF and ELSE clauses are actually implemented with CMP to
    * avoid using IF/ELSE/ENDIF TGSI opcodes.
    */

#if !NORMALIZE
   k = 1.0f / radius;
   k = 1.0f - 2.0f * k + k * k;
#else
   k = 1.0f - 1.0f / radius;
#endif

   /* allocate/dup new verts */
   for (i = 0; i < 4; i++) {
      v[i] = dup_vert(stage, header->v[0], i);
   }

   /* new verts */
   pos = v[0]->data[pos_slot];
   pos[0] -= radius;
   pos[1] -= radius;

   pos = v[1]->data[pos_slot];
   pos[0] += radius;
   pos[1] -= radius;

   pos = v[2]->data[pos_slot];
   pos[0] += radius;
   pos[1] += radius;

   pos = v[3]->data[pos_slot];
   pos[0] -= radius;
   pos[1] += radius;

   /* new texcoords */
   tex = v[0]->data[texPos];
   ASSIGN_4V(tex, -1, -1, k, 1);

   tex = v[1]->data[texPos];
   ASSIGN_4V(tex,  1, -1, k, 1);

   tex = v[2]->data[texPos];
   ASSIGN_4V(tex,  1,  1, k, 1);

   tex = v[3]->data[texPos];
   ASSIGN_4V(tex, -1,  1, k, 1);

   /* emit 2 tris for the quad strip */
   tri.v[0] = v[0];
   tri.v[1] = v[1];
   tri.v[2] = v[2];
   stage->next->tri( stage->next, &tri );

   tri.v[0] = v[0];
   tri.v[1] = v[2];
   tri.v[2] = v[3];
   stage->next->tri( stage->next, &tri );

static void aapoint_reset_stipple_counter

(

struct draw_stage *

stage

)

[static]

Definition at line 735 of file draw_pipe_aapoint.c.

References draw_stage::next, and draw_stage::reset_stipple_counter.

{
   stage->next->reset_stipple_counter( stage->next );

static struct aapoint_stage* aapoint_stage

(

struct draw_stage *

stage

)

[static, read]

Definition at line 558 of file draw_pipe_aapoint.c.

{
   return (struct aapoint_stage *) stage;
}

static struct aapoint_stage* aapoint_stage_from_pipe

(

struct pipe_context *

pipe

)

[static, read]

Definition at line 780 of file draw_pipe_aapoint.c.

References draw_context::aapoint, pipe_context::draw, draw, and draw_context::pipeline.

{
   struct draw_context *draw = (struct draw_context *) pipe->draw;
   return aapoint_stage(draw->pipeline.aapoint);

static boolean bind_aapoint_fragment_shader

(

struct aapoint_stage *

aapoint

)

[static]

When we're about to draw our first AA point in a batch, this function is called to tell the driver to bind our modified fragment shader.

Definition at line 540 of file draw_pipe_aapoint.c.

References aapoint_fragment_shader::aapoint_fs, draw_stage::draw, draw, aapoint_stage::driver_bind_fs_state, FALSE, aapoint_stage::fs, generate_aapoint_fs(), aapoint_stage::pipe, aapoint_stage::stage, draw_context::suspend_flushing, and TRUE.

{
   struct draw_context *draw = aapoint->stage.draw;

   if (!aapoint->fs->aapoint_fs &&
       !generate_aapoint_fs(aapoint))
      return FALSE;

   draw->suspend_flushing = TRUE;
   aapoint->driver_bind_fs_state(aapoint->pipe, aapoint->fs->aapoint_fs);
   draw->suspend_flushing = FALSE;

   return TRUE;
}

static struct aapoint_stage* draw_aapoint_stage

(

struct draw_context *

draw

)

[static, read]

Definition at line 750 of file draw_pipe_aapoint.c.

References aapoint_destroy(), aapoint_first_point(), aapoint_flush(), aapoint_reset_stipple_counter(), CALLOC_STRUCT, draw_stage::destroy, draw_stage::draw, draw_alloc_temp_verts(), draw_pipe_passthrough_line(), draw_pipe_passthrough_tri(), draw_stage::flush, draw_stage::line, draw_stage::next, draw_stage::point, draw_stage::reset_stipple_counter, aapoint_stage::stage, and draw_stage::tri.

{
   struct aapoint_stage *aapoint = CALLOC_STRUCT(aapoint_stage);
   if (aapoint == NULL)
      goto fail;

   if (!draw_alloc_temp_verts( &aapoint->stage, 4 ))
      goto fail;

   aapoint->stage.draw = draw;
   aapoint->stage.next = NULL;
   aapoint->stage.point = aapoint_first_point;
   aapoint->stage.line = draw_pipe_passthrough_line;
   aapoint->stage.tri = draw_pipe_passthrough_tri;
   aapoint->stage.flush = aapoint_flush;
   aapoint->stage.reset_stipple_counter = aapoint_reset_stipple_counter;
   aapoint->stage.destroy = aapoint_destroy;

   return aapoint;

 fail:
   if (aapoint)
      aapoint_destroy(&aapoint->stage);

   return NULL;

boolean draw_install_aapoint_stage	(	struct draw_context *	draw,
		struct pipe_context *	pipe
	)

Called by drivers that want to install this AA point prim stage into the draw module's pipeline.

This will not be used if the hardware has native support for AA points.

Definition at line 839 of file draw_pipe_aapoint.c.

References draw_context::aapoint, aapoint_bind_fs_state(), aapoint_create_fs_state(), aapoint_delete_fs_state(), pipe_context::bind_fs_state, pipe_context::create_fs_state, pipe_context::delete_fs_state, draw_stage::destroy, pipe_context::draw, draw_aapoint_stage(), aapoint_stage::driver_bind_fs_state, aapoint_stage::driver_create_fs_state, aapoint_stage::driver_delete_fs_state, FALSE, aapoint_stage::pipe, draw_context::pipeline, aapoint_stage::stage, and TRUE.

{
   struct aapoint_stage *aapoint;

   pipe->draw = (void *) draw;

   /*
    * Create / install AA point drawing / prim stage
    */
   aapoint = draw_aapoint_stage( draw );
   if (aapoint == NULL)
      goto fail;

   aapoint->pipe = pipe;

   /* save original driver functions */
   aapoint->driver_create_fs_state = pipe->create_fs_state;
   aapoint->driver_bind_fs_state = pipe->bind_fs_state;
   aapoint->driver_delete_fs_state = pipe->delete_fs_state;

   /* override the driver's functions */
   pipe->create_fs_state = aapoint_create_fs_state;
   pipe->bind_fs_state = aapoint_bind_fs_state;
   pipe->delete_fs_state = aapoint_delete_fs_state;

   draw->pipeline.aapoint = &aapoint->stage;

   return TRUE;

 fail:
   if (aapoint)
      aapoint->stage.destroy( &aapoint->stage );

   return FALSE;

static boolean generate_aapoint_fs

(

struct aapoint_stage *

aapoint

)

[static]

Generate the frag shader we'll use for drawing AA points.

This will be the user's shader plus some texture/modulate instructions.

Definition at line 490 of file draw_pipe_aapoint.c.

References aa_transform_decl(), aa_transform_inst(), aapoint_fragment_shader::aapoint_fs, aa_transform_context::base, aa_transform_context::colorOutput, aa_transform_context::colorTemp, aapoint_stage::driver_create_fs_state, FALSE, aa_transform_context::firstInstruction, aapoint_stage::fs, aapoint_fragment_shader::generic_attrib, MALLOC, MAX, aa_transform_context::maxGeneric, aa_transform_context::maxInput, aapoint_stage::pipe, aapoint_fragment_shader::state, tgsi_dump(), tgsi_transform_shader(), aa_transform_context::tmp0, pipe_shader_state::tokens, tgsi_transform_context::transform_declaration, tgsi_transform_context::transform_instruction, and TRUE.

{
   const struct pipe_shader_state *orig_fs = &aapoint->fs->state;
   struct pipe_shader_state aapoint_fs;
   struct aa_transform_context transform;

#define MAX 1000

   aapoint_fs = *orig_fs; /* copy to init */
   aapoint_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
   if (aapoint_fs.tokens == NULL)
      return FALSE;

   memset(&transform, 0, sizeof(transform));
   transform.colorOutput = -1;
   transform.maxInput = -1;
   transform.maxGeneric = -1;
   transform.colorTemp = -1;
   transform.tmp0 = -1;
   transform.firstInstruction = TRUE;
   transform.base.transform_instruction = aa_transform_inst;
   transform.base.transform_declaration = aa_transform_decl;

   tgsi_transform_shader(orig_fs->tokens,
                         (struct tgsi_token *) aapoint_fs.tokens,
                         MAX, &transform.base);

#if 0 /* DEBUG */
   printf("draw_aapoint, orig shader:\n");
   tgsi_dump(orig_fs->tokens, 0);
   printf("draw_aapoint, new shader:\n");
   tgsi_dump(aapoint_fs.tokens, 0);
#endif

   aapoint->fs->aapoint_fs
      = aapoint->driver_create_fs_state(aapoint->pipe, &aapoint_fs);
   if (aapoint->fs->aapoint_fs == NULL)
      return FALSE;

   aapoint->fs->generic_attrib = transform.maxGeneric + 1;

   return TRUE;
}

---