--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * 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
+ */
+
+
+#include "pipe/p_util.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_shader_tokens.h"
+
+#include "tgsi/util/tgsi_transform.h"
+#include "tgsi/util/tgsi_dump.h"
+
+#include "draw_context.h"
+#include "draw_private.h"
+
+
+/*
+ * Enabling NORMALIZE might give _slightly_ better results.
+ * Basically, it controls whether we compute distance as d=sqrt(x*x+y*y) or
+ * d=x*x+y*y. Since we're working with a unit circle, the later seems
+ * close enough and saves some costly instructions.
+ */
+#define NORMALIZE 0
+
+
+/**
+ * Subclass of pipe_shader_state to carry extra fragment shader info.
+ */
+struct aapoint_fragment_shader
+{
+ struct pipe_shader_state state;
+ void *driver_fs; /**< the regular shader */
+ void *aapoint_fs; /**< the aa point-augmented shader */
+};
+
+
+/**
+ * Subclass of draw_stage
+ */
+struct aapoint_stage
+{
+ struct draw_stage stage;
+
+ int psize_slot;
+ float radius;
+
+ /** this is the vertex attrib slot for the new texcoords */
+ uint tex_slot;
+
+ /*
+ * Currently bound state
+ */
+ struct aapoint_fragment_shader *fs;
+
+ /*
+ * Driver interface/override functions
+ */
+ void * (*driver_create_fs_state)(struct pipe_context *,
+ const struct pipe_shader_state *);
+ void (*driver_bind_fs_state)(struct pipe_context *, void *);
+ void (*driver_delete_fs_state)(struct pipe_context *, void *);
+
+ struct pipe_context *pipe;
+};
+
+
+
+/**
+ * Subclass of tgsi_transform_context, used for transforming the
+ * user's fragment shader to add the special AA instructions.
+ */
+struct aa_transform_context {
+ struct tgsi_transform_context base;
+ uint tempsUsed; /**< bitmask */
+ int colorOutput; /**< which output is the primary color */
+ int maxInput, maxGeneric; /**< max input index found */
+ int tmp0, colorTemp; /**< temp registers */
+ boolean firstInstruction;
+};
+
+
+/**
+ * TGSI declaration transform callback.
+ * Look for two free temp regs and available input reg for new texcoords.
+ */
+static void
+aa_transform_decl(struct tgsi_transform_context *ctx,
+ struct tgsi_full_declaration *decl)
+{
+ 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->u.DeclarationRange.First;
+ }
+ else if (decl->Declaration.File == TGSI_FILE_INPUT) {
+ if ((int) decl->u.DeclarationRange.Last > aactx->maxInput)
+ aactx->maxInput = decl->u.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->u.DeclarationRange.First;
+ i <= decl->u.DeclarationRange.Last; i++) {
+ aactx->tempsUsed |= (1 << i);
+ }
+ }
+
+ ctx->emit_declaration(ctx, decl);
+}
+
+
+/**
+ * TGSI instruction transform callback.
+ * Replace writes to result.color w/ a temp reg.
+ * Upon END instruction, insert texture sampling code for antialiasing.
+ */
+static void
+aa_transform_inst(struct tgsi_transform_context *ctx,
+ struct tgsi_full_instruction *inst)
+{
+ 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;
+ decl.Declaration.Semantic = 1;
+ decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
+ decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
+ decl.Declaration.Interpolate = 1;
+ /* XXX this could be linear... */
+ decl.Interpolation.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
+ decl.u.DeclarationRange.First =
+ decl.u.DeclarationRange.Last = texInput;
+ ctx->emit_declaration(ctx, &decl);
+
+ /* declare new temp regs */
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_TEMPORARY;
+ decl.u.DeclarationRange.First =
+ decl.u.DeclarationRange.Last = tmp0;
+ ctx->emit_declaration(ctx, &decl);
+
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_TEMPORARY;
+ decl.u.DeclarationRange.First =
+ decl.u.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 ?
+ * 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);
+
+ /* KILP -t0.yyyy; # if b, KILL */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_KILP;
+ 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);
+
+ /* SGT t0.y, t0.x, tex.z; # bool b = distance > k */
+ 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_Z;
+ ctx->emit_instruction(ctx, &newInst);
+
+ /* IF t0.y # if b then */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_IF;
+ 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;
+ 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.x, 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_X;
+ newInst.Instruction.NumSrcRegs = 2;
+ newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
+ newInst.FullSrcRegisters[0].SrcRegister.Index = texInput;
+ newInst.FullSrcRegisters[0].SrcRegister.SwizzleX = TGSI_SWIZZLE_W;
+ newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
+ newInst.FullSrcRegisters[1].SrcRegister.Index = tmp0;
+ newInst.FullSrcRegisters[1].SrcRegister.SwizzleX = TGSI_SWIZZLE_X;
+ ctx->emit_instruction(ctx, &newInst);
+
+ /* MUL t0.w, t0.x, 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_X;
+ 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);
+ }
+
+ /* ELSE */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_ELSE;
+ newInst.Instruction.NumDstRegs = 0;
+ newInst.Instruction.NumSrcRegs = 0;
+ ctx->emit_instruction(ctx, &newInst);
+
+ {
+ /* MOV t0.w, tex.w; # coverage = 1.0 */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ 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 = 1;
+ newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
+ newInst.FullSrcRegisters[0].SrcRegister.Index = texInput;
+ ctx->emit_instruction(ctx, &newInst);
+ }
+
+ /* ENDIF */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_ENDIF;
+ newInst.Instruction.NumDstRegs = 0;
+ newInst.Instruction.NumSrcRegs = 0;
+ 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);
+}
+
+
+/**
+ * Generate the frag shader we'll use for drawing AA lines.
+ * This will be the user's shader plus some texture/modulate instructions.
+ */
+static void
+generate_aapoint_fs(struct aapoint_stage *aapoint)
+{
+ const struct pipe_shader_state *orig_fs = &aapoint->fs->state;
+ struct draw_context *draw = aapoint->stage.draw;
+ 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);
+
+ 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 */
+ tgsi_dump(orig_fs->tokens, 0);
+ tgsi_dump(aapoint_fs.tokens, 0);
+#endif
+
+ aapoint_fs.input_semantic_name[aapoint_fs.num_inputs] = TGSI_SEMANTIC_GENERIC;
+ aapoint_fs.input_semantic_index[aapoint_fs.num_inputs] = transform.maxGeneric + 1;
+ aapoint_fs.num_inputs++;
+
+ aapoint->fs->aapoint_fs
+ = aapoint->driver_create_fs_state(aapoint->pipe, &aapoint_fs);
+
+ /* advertise the extra post-transform vertex attributes which will have
+ * the texcoords.
+ */
+ draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
+ draw->extra_vp_outputs.semantic_index = transform.maxGeneric + 1;
+}
+
+
+/**
+ * When we're about to draw our first AA line in a batch, this function is
+ * called to tell the driver to bind our modified fragment shader.
+ */
+static void
+bind_aapoint_fragment_shader(struct aapoint_stage *aapoint)
+{
+ if (!aapoint->fs->aapoint_fs) {
+ generate_aapoint_fs(aapoint);
+ }
+ aapoint->driver_bind_fs_state(aapoint->pipe, aapoint->fs->aapoint_fs);
+}
+
+
+
+static INLINE struct aapoint_stage *
+aapoint_stage( struct draw_stage *stage )
+{
+ return (struct aapoint_stage *) stage;
+}
+
+
+static void
+passthrough_line(struct draw_stage *stage, struct prim_header *header)
+{
+ stage->next->line(stage->next, header);
+}
+
+
+static void
+passthrough_tri(struct draw_stage *stage, struct prim_header *header)
+{
+ stage->next->tri(stage->next, header);
+}
+
+
+/**
+ * Draw an AA point by drawing a quad.
+ */
+static void
+aapoint_point(struct draw_stage *stage, struct prim_header *header)
+{
+ const struct aapoint_stage *aapoint = aapoint_stage(stage);
+ struct prim_header tri;
+ struct vertex_header *v[4];
+ uint texPos = aapoint->tex_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
+ */
+
+#if !NORMALIZE
+ k = 1.0 / radius;
+ k = 1.0 - 2.0 * k + k * k;
+#else
+ k = 1.0 - 1.0 / 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[0];
+ pos[0] -= radius;
+ pos[1] -= radius;
+
+ pos = v[1]->data[0];
+ pos[0] += radius;
+ pos[1] -= radius;
+
+ pos = v[2]->data[0];
+ pos[0] += radius;
+ pos[1] += radius;
+
+ pos = v[3]->data[0];
+ 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_first_point(struct draw_stage *stage, struct prim_header *header)
+{
+ 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;
+
+ aapoint->tex_slot = draw->num_vs_outputs;
+ assert(aapoint->tex_slot > 0); /* output[0] is vertex pos */
+ draw->extra_vp_outputs.slot = aapoint->tex_slot;
+
+ /*
+ * Bind our fragprog.
+ */
+ bind_aapoint_fragment_shader(aapoint);
+
+ /* 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->vertex_shader;
+ uint i;
+ for (i = 0; i < vs->state->num_outputs; i++) {
+ if (vs->state->output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) {
+ aapoint->psize_slot = i;
+ break;
+ }
+ }
+ }
+
+ /* now really draw first line */
+ stage->point = aapoint_point;
+ stage->point(stage, header);
+}
+
+
+static void
+aapoint_flush(struct draw_stage *stage, unsigned flags)
+{
+ 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 */
+ aapoint->driver_bind_fs_state(pipe, aapoint->fs->driver_fs);
+
+ draw->extra_vp_outputs.slot = 0;
+}
+
+
+static void
+aapoint_reset_stipple_counter(struct draw_stage *stage)
+{
+ stage->next->reset_stipple_counter( stage->next );
+}
+
+
+static void
+aapoint_destroy(struct draw_stage *stage)
+{
+ draw_free_temp_verts( stage );
+ FREE( stage );
+}
+
+
+static struct aapoint_stage *
+draw_aapoint_stage(struct draw_context *draw)
+{
+ struct aapoint_stage *aapoint = CALLOC_STRUCT(aapoint_stage);
+
+ draw_alloc_temp_verts( &aapoint->stage, 4 );
+
+ aapoint->stage.draw = draw;
+ aapoint->stage.next = NULL;
+ aapoint->stage.point = aapoint_first_point;
+ aapoint->stage.line = passthrough_line;
+ aapoint->stage.tri = passthrough_tri;
+ aapoint->stage.flush = aapoint_flush;
+ aapoint->stage.reset_stipple_counter = aapoint_reset_stipple_counter;
+ aapoint->stage.destroy = aapoint_destroy;
+
+ return aapoint;
+}
+
+
+/*
+ * XXX temporary? solution to mapping a pipe_context to a aapoint_stage.
+ */
+
+#define MAX_CONTEXTS 10
+
+static struct pipe_context *Pipe[MAX_CONTEXTS];
+static struct aapoint_stage *Stage[MAX_CONTEXTS];
+static uint NumContexts;
+
+static void
+add_aa_pipe_context(struct pipe_context *pipe, struct aapoint_stage *aa)
+{
+ assert(NumContexts < MAX_CONTEXTS);
+ Pipe[NumContexts] = pipe;
+ Stage[NumContexts] = aa;
+ NumContexts++;
+}
+
+static struct aapoint_stage *
+aapoint_stage_from_pipe(struct pipe_context *pipe)
+{
+ uint i;
+ for (i = 0; i < NumContexts; i++) {
+ if (Pipe[i] == pipe)
+ return Stage[i];
+ }
+ assert(0);
+ return NULL;
+}
+
+
+/**
+ * This function overrides the driver's create_fs_state() function and
+ * will typically be called by the state tracker.
+ */
+static void *
+aapoint_create_fs_state(struct pipe_context *pipe,
+ const struct pipe_shader_state *fs)
+{
+ struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe);
+ struct aapoint_fragment_shader *aafs = CALLOC_STRUCT(aapoint_fragment_shader);
+
+ if (aafs) {
+ aafs->state = *fs;
+
+ /* pass-through */
+ aafs->driver_fs = aapoint->driver_create_fs_state(aapoint->pipe, fs);
+ }
+
+ return aafs;
+}
+
+
+static void
+aapoint_bind_fs_state(struct pipe_context *pipe, void *fs)
+{
+ 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->driver_fs);
+}
+
+
+static void
+aapoint_delete_fs_state(struct pipe_context *pipe, void *fs)
+{
+ 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);
+}
+
+
+/**
+ * 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.
+ */
+void
+draw_install_aapoint_stage(struct draw_context *draw,
+ struct pipe_context *pipe)
+{
+ struct aapoint_stage *aapoint;
+
+ /*
+ * Create / install AA point drawing / prim stage
+ */
+ aapoint = draw_aapoint_stage( draw );
+ assert(aapoint);
+ draw->pipeline.aapoint = &aapoint->stage;
+
+ 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;
+
+ add_aa_pipe_context(pipe, aapoint);
+}
projects / mesa.git / commitdiff