--- /dev/null
+/**************************************************************************
+ *
+ * Copyright 2007 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 line stage: AA lines are converted to texture mapped triangles.
+ *
+ * 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"
+
+
+/**
+ * Max texture level for the alpha texture used for antialiasing
+ */
+#define MAX_TEXTURE_LEVEL 5 /* 32 x 32 */
+
+
+/**
+ * Subclass of pipe_shader_state to carry extra fragment shader info.
+ */
+struct aaline_fragment_shader
+{
+ struct pipe_shader_state state;
+ void *driver_fs;
+ void *aaline_fs;
+ void *aapoint_fs; /* not yet */
+ void *sprite_fs; /* not yet */
+};
+
+
+/**
+ * Subclass of draw_stage
+ */
+struct aaline_stage
+{
+ struct draw_stage stage;
+
+ float half_line_width;
+
+ /** For AA lines, this is the vertex attrib slot for the new texcoords */
+ uint tex_slot;
+
+ void *sampler_cso;
+ struct pipe_texture *texture;
+ uint sampler_unit;
+
+
+ /*
+ * Currently bound state
+ */
+ struct aaline_fragment_shader *fs;
+ struct {
+ void *sampler[PIPE_MAX_SAMPLERS];
+ struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
+ } state;
+
+ /*
+ * 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 *);
+
+ void (*driver_bind_sampler_state)(struct pipe_context *, unsigned, void *);
+
+ void (*driver_set_sampler_texture)(struct pipe_context *,
+ unsigned sampler,
+ struct pipe_texture *);
+
+ 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 maxSampler; /**< max sampler index found */
+ int maxInput, maxGeneric; /**< max input index found */
+ int colorTemp, texTemp; /**< temp registers */
+ boolean firstInstruction;
+};
+
+
+/**
+ * TGSI declaration transform callback.
+ * Look for a free sampler, a free input attrib, and two free temp regs.
+ */
+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_SAMPLER) {
+ if (decl->u.DeclarationRange.Last > aactx->maxSampler)
+ aactx->maxSampler = decl->u.DeclarationRange.Last + 1;
+ }
+ else if (decl->Declaration.File == TGSI_FILE_INPUT) {
+ if (decl->u.DeclarationRange.Last > aactx->maxInput)
+ aactx->maxInput = decl->u.DeclarationRange.Last;
+ if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
+ 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;
+
+ if (aactx->firstInstruction) {
+ /* emit our new declarations before the first instruction */
+
+ struct tgsi_full_declaration decl;
+ 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->colorTemp < 0)
+ aactx->colorTemp = i;
+ else if (aactx->texTemp < 0)
+ aactx->texTemp = i;
+ else
+ break;
+ }
+ }
+ assert(aactx->colorTemp >= 0);
+ assert(aactx->texTemp >= 0);
+
+ /* 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 = aactx->maxInput + 1;
+ ctx->emit_declaration(ctx, &decl);
+
+ /* declare new sampler */
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_SAMPLER;
+ decl.u.DeclarationRange.First =
+ decl.u.DeclarationRange.Last = aactx->maxSampler + 1;
+ 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 = aactx->texTemp;
+ 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;
+ }
+
+ if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
+ aactx->colorOutput != -1) {
+ struct tgsi_full_instruction newInst;
+
+ /* TEX */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
+ newInst.Instruction.NumDstRegs = 1;
+ newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
+ newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
+ newInst.Instruction.NumSrcRegs = 2;
+ newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
+ newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
+ newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
+ newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
+ newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->maxSampler + 1;
+
+ ctx->emit_instruction(ctx, &newInst);
+
+ /* MOV rgb */
+ 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 alpha */
+ 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->texTemp;
+ ctx->emit_instruction(ctx, &newInst);
+
+ /* END */
+ newInst = tgsi_default_full_instruction();
+ newInst.Instruction.Opcode = TGSI_OPCODE_END;
+ newInst.Instruction.NumDstRegs = 0;
+ newInst.Instruction.NumSrcRegs = 0;
+ 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_aaline_fs(struct aaline_stage *aaline)
+{
+ const struct pipe_shader_state *orig_fs = &aaline->fs->state;
+ struct draw_context *draw = aaline->stage.draw;
+ struct pipe_shader_state aaline_fs;
+ struct aa_transform_context transform;
+
+#define MAX 1000
+
+ aaline_fs = *orig_fs; /* copy to init */
+ aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
+
+ memset(&transform, 0, sizeof(transform));
+ transform.colorOutput = -1;
+ transform.maxSampler = -1;
+ transform.maxInput = -1;
+ transform.maxGeneric = -1;
+ transform.colorTemp = -1;
+ transform.texTemp = -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 *) aaline_fs.tokens,
+ MAX, &transform.base);
+
+#if 0 /* DEBUG */
+ tgsi_dump(orig_fs->tokens, 0);
+ tgsi_dump(aaline_fs.tokens, 0);
+#endif
+
+ aaline_fs.input_semantic_name[aaline_fs.num_inputs] = TGSI_SEMANTIC_GENERIC;
+ aaline_fs.input_semantic_index[aaline_fs.num_inputs] = transform.maxGeneric + 1;
+ aaline_fs.num_inputs++;
+
+ aaline->fs->aaline_fs
+ = aaline->driver_create_fs_state(aaline->pipe, &aaline_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;
+}
+
+
+/**
+ * Create the texture map we'll use for antialiasing the lines.
+ */
+static void
+aaline_create_texture(struct aaline_stage *aaline)
+{
+ struct pipe_context *pipe = aaline->pipe;
+ struct pipe_texture texTemp;
+ uint level;
+
+ memset(&texTemp, 0, sizeof(texTemp));
+ texTemp.target = PIPE_TEXTURE_2D;
+ texTemp.format = PIPE_FORMAT_U_A8; /* XXX verify supported by driver! */
+ texTemp.last_level = MAX_TEXTURE_LEVEL;
+ texTemp.width[0] = 1 << MAX_TEXTURE_LEVEL;
+ texTemp.height[0] = 1 << MAX_TEXTURE_LEVEL;
+ texTemp.depth[0] = 1;
+ texTemp.cpp = 1;
+
+ aaline->texture = pipe->texture_create(pipe, &texTemp);
+
+ /* Fill in mipmap images.
+ * Basically each level is solid opaque, except for the outermost
+ * texels which are zero. Special case the 1x1 and 2x2 levels.
+ */
+ for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
+ struct pipe_surface *surface;
+ const uint size = aaline->texture->width[level];
+ ubyte *data;
+ uint i, j;
+
+ assert(aaline->texture->width[level] == aaline->texture->height[level]);
+
+ surface = pipe->get_tex_surface(pipe, aaline->texture, 0, level, 0);
+ data = pipe_surface_map(surface);
+
+ for (i = 0; i < size; i++) {
+ for (j = 0; j < size; j++) {
+ uint d;
+ if (size == 1) {
+ d = 255;
+ }
+ else if (size == 2) {
+ d = 200; /* tuneable */
+ }
+ else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
+ d = 0;
+ }
+ else {
+ d = 255;
+ }
+ data[i * surface->pitch + j] = d;
+ }
+ }
+
+ /* unmap */
+ pipe_surface_unmap(surface);
+ pipe_surface_reference(&surface, NULL);
+ }
+}
+
+
+/**
+ * Create the sampler CSO that'll be used for antialiasing.
+ * By using a mipmapped texture, we don't have to generate a different
+ * texture image for each line size.
+ */
+static void
+aaline_create_sampler(struct aaline_stage *aaline)
+{
+ struct pipe_sampler_state sampler;
+ struct pipe_context *pipe = aaline->pipe;
+
+ memset(&sampler, 0, sizeof(sampler));
+ sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+ sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+ sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
+ sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
+ sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
+ sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
+ sampler.normalized_coords = 1;
+ sampler.min_lod = 0.0f;
+ sampler.max_lod = MAX_TEXTURE_LEVEL;
+
+ aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
+}
+
+
+/**
+ * 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_aaline_fragment_shader(struct aaline_stage *aaline)
+{
+ if (!aaline->fs->aaline_fs) {
+ generate_aaline_fs(aaline);
+ }
+ aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
+}
+
+
+
+static INLINE struct aaline_stage *
+aaline_stage( struct draw_stage *stage )
+{
+ return (struct aaline_stage *) stage;
+}
+
+
+static void
+passthrough_point(struct draw_stage *stage, struct prim_header *header)
+{
+ stage->next->point(stage->next, header);
+}
+
+
+static void
+passthrough_tri(struct draw_stage *stage, struct prim_header *header)
+{
+ stage->next->tri(stage->next, header);
+}
+
+
+/**
+ * Draw a wide line by drawing a quad, using geometry which will
+ * fullfill GL's antialiased line requirements.
+ */
+static void
+aaline_line(struct draw_stage *stage, struct prim_header *header)
+{
+ const struct aaline_stage *aaline = aaline_stage(stage);
+ const float half_width = aaline->half_line_width;
+ struct prim_header tri;
+ struct vertex_header *v[8];
+ uint texPos = aaline->tex_slot;
+ float *pos, *tex;
+ float dx = header->v[1]->data[0][0] - header->v[0]->data[0][0];
+ float dy = header->v[1]->data[0][1] - header->v[0]->data[0][1];
+ float a = atan2(dy, dx);
+ float c_a = cos(a), s_a = sin(a);
+ uint i;
+
+ /* XXX the ends of lines aren't quite perfect yet, but probably passable */
+ dx = 0.5 * half_width;
+ dy = half_width;
+
+ /* allocate/dup new verts */
+ for (i = 0; i < 8; i++) {
+ v[i] = dup_vert(stage, header->v[i/4], i);
+ }
+
+ /*
+ * Quad strip for line from v0 to v1 (*=endpoints):
+ *
+ * 1 3 5 7
+ * +---+---------------------+---+
+ * | |
+ * | *v0 v1* |
+ * | |
+ * +---+---------------------+---+
+ * 0 2 4 6
+ */
+
+ /* new verts */
+ pos = v[0]->data[0];
+ pos[0] += (-dx * c_a - dy * s_a);
+ pos[1] += (-dx * s_a + dy * c_a);
+
+ pos = v[1]->data[0];
+ pos[0] += (-dx * c_a - -dy * s_a);
+ pos[1] += (-dx * s_a + -dy * c_a);
+
+ pos = v[2]->data[0];
+ pos[0] += ( dx * c_a - dy * s_a);
+ pos[1] += ( dx * s_a + dy * c_a);
+
+ pos = v[3]->data[0];
+ pos[0] += ( dx * c_a - -dy * s_a);
+ pos[1] += ( dx * s_a + -dy * c_a);
+
+ pos = v[4]->data[0];
+ pos[0] += (-dx * c_a - dy * s_a);
+ pos[1] += (-dx * s_a + dy * c_a);
+
+ pos = v[5]->data[0];
+ pos[0] += (-dx * c_a - -dy * s_a);
+ pos[1] += (-dx * s_a + -dy * c_a);
+
+ pos = v[6]->data[0];
+ pos[0] += ( dx * c_a - dy * s_a);
+ pos[1] += ( dx * s_a + dy * c_a);
+
+ pos = v[7]->data[0];
+ pos[0] += ( dx * c_a - -dy * s_a);
+ pos[1] += ( dx * s_a + -dy * c_a);
+
+ /* new texcoords */
+ tex = v[0]->data[texPos];
+ ASSIGN_4V(tex, 0, 0, 0, 1);
+
+ tex = v[1]->data[texPos];
+ ASSIGN_4V(tex, 0, 1, 0, 1);
+
+ tex = v[2]->data[texPos];
+ ASSIGN_4V(tex, .5, 0, 0, 1);
+
+ tex = v[3]->data[texPos];
+ ASSIGN_4V(tex, .5, 1, 0, 1);
+
+ tex = v[4]->data[texPos];
+ ASSIGN_4V(tex, .5, 0, 0, 1);
+
+ tex = v[5]->data[texPos];
+ ASSIGN_4V(tex, .5, 1, 0, 1);
+
+ tex = v[6]->data[texPos];
+ ASSIGN_4V(tex, 1, 0, 0, 1);
+
+ tex = v[7]->data[texPos];
+ ASSIGN_4V(tex, 1, 1, 0, 1);
+
+ /* emit 6 tris for the quad strip */
+ tri.v[0] = v[2]; tri.v[1] = v[1]; tri.v[2] = v[0];
+ stage->next->tri( stage->next, &tri );
+
+ tri.v[0] = v[3]; tri.v[1] = v[1]; tri.v[2] = v[2];
+ stage->next->tri( stage->next, &tri );
+
+ tri.v[0] = v[4]; tri.v[1] = v[3]; tri.v[2] = v[2];
+ stage->next->tri( stage->next, &tri );
+
+ tri.v[0] = v[5]; tri.v[1] = v[3]; tri.v[2] = v[4];
+ stage->next->tri( stage->next, &tri );
+
+ tri.v[0] = v[6]; tri.v[1] = v[5]; tri.v[2] = v[4];
+ stage->next->tri( stage->next, &tri );
+
+ tri.v[0] = v[7]; tri.v[1] = v[5]; tri.v[2] = v[6];
+ stage->next->tri( stage->next, &tri );
+}
+
+
+static void
+aaline_first_line(struct draw_stage *stage, struct prim_header *header)
+{
+ auto struct aaline_stage *aaline = aaline_stage(stage);
+ struct draw_context *draw = stage->draw;
+ struct pipe_context *pipe = aaline->pipe;
+
+ assert(draw->rasterizer->line_smooth);
+
+ if (draw->rasterizer->line_width <= 3.0)
+ aaline->half_line_width = 1.5f;
+ else
+ aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
+
+ aaline->tex_slot = draw->num_vs_outputs;
+ assert(aaline->tex_slot > 0); /* output[0] is vertex pos */
+ draw->extra_vp_outputs.slot = aaline->tex_slot;
+
+ /*
+ * Bind our fragprog, sampler and texture
+ */
+ bind_aaline_fragment_shader(aaline);
+
+ aaline->driver_bind_sampler_state(pipe, aaline->sampler_unit, aaline->sampler_cso);
+ aaline->driver_set_sampler_texture(pipe, aaline->sampler_unit, aaline->texture);
+
+ /* now really draw first line */
+ stage->line = aaline_line;
+ stage->line(stage, header);
+}
+
+
+static void
+aaline_flush(struct draw_stage *stage, unsigned flags)
+{
+ struct draw_context *draw = stage->draw;
+ struct aaline_stage *aaline = aaline_stage(stage);
+ struct pipe_context *pipe = aaline->pipe;
+
+ stage->line = aaline_first_line;
+ stage->next->flush( stage->next, flags );
+
+ /* restore original frag shader */
+ aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
+
+ /* XXX restore original texture, sampler state */
+ aaline->driver_bind_sampler_state(pipe, aaline->sampler_unit,
+ aaline->state.sampler[aaline->sampler_unit]);
+ aaline->driver_set_sampler_texture(pipe, aaline->sampler_unit,
+ aaline->state.texture[aaline->sampler_unit]);
+
+ draw->extra_vp_outputs.slot = 0;
+}
+
+
+static void
+aaline_reset_stipple_counter(struct draw_stage *stage)
+{
+ stage->next->reset_stipple_counter( stage->next );
+}
+
+
+static void
+aaline_destroy(struct draw_stage *stage)
+{
+ draw_free_temp_verts( stage );
+ FREE( stage );
+}
+
+
+static struct aaline_stage *
+draw_aaline_stage(struct draw_context *draw)
+{
+ struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
+
+ draw_alloc_temp_verts( &aaline->stage, 8 );
+
+ aaline->stage.draw = draw;
+ aaline->stage.next = NULL;
+ aaline->stage.point = passthrough_point;
+ aaline->stage.line = aaline_first_line;
+ aaline->stage.tri = passthrough_tri;
+ aaline->stage.flush = aaline_flush;
+ aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
+ aaline->stage.destroy = aaline_destroy;
+
+ return aaline;
+}
+
+
+/*
+ * XXX temporary? solution to mapping a pipe_context to a aaline_stage.
+ */
+
+#define MAX_CONTEXTS 10
+
+static struct pipe_context *Pipe[MAX_CONTEXTS];
+static struct aaline_stage *Stage[MAX_CONTEXTS];
+static uint NumContexts;
+
+static void
+add_aa_pipe_context(struct pipe_context *pipe, struct aaline_stage *aa)
+{
+ assert(NumContexts < MAX_CONTEXTS);
+ Pipe[NumContexts] = pipe;
+ Stage[NumContexts] = aa;
+ NumContexts++;
+}
+
+static struct aaline_stage *
+aaline_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 *
+aaline_create_fs_state(struct pipe_context *pipe,
+ const struct pipe_shader_state *fs)
+{
+ struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
+ struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
+
+ if (aafs) {
+ aafs->state = *fs;
+
+ /* pass-through */
+ aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
+ }
+
+ return aafs;
+}
+
+
+static void
+aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
+{
+ struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
+ struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
+ /* save current */
+ aaline->fs = aafs;
+ /* pass-through */
+ aaline->driver_bind_fs_state(aaline->pipe, aafs->driver_fs);
+}
+
+
+static void
+aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
+{
+ struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
+ struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
+ /* pass-through */
+ aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
+ FREE(aafs);
+}
+
+
+static void
+aaline_bind_sampler_state(struct pipe_context *pipe,
+ unsigned unit, void *sampler)
+{
+ struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
+ /* save current */
+ aaline->state.sampler[unit] = sampler;
+ /* pass-through */
+ aaline->driver_bind_sampler_state(aaline->pipe, unit, sampler);
+}
+
+
+static void
+aaline_set_sampler_texture(struct pipe_context *pipe,
+ unsigned sampler, struct pipe_texture *texture)
+{
+ struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
+ /* save current */
+ aaline->state.texture[sampler] = texture;
+ /* pass-through */
+ aaline->driver_set_sampler_texture(aaline->pipe, sampler, texture);
+}
+
+
+/**
+ * Called by drivers that want to install this AA line prim stage
+ * into the draw module's pipeline. This will not be used if the
+ * hardware has native support for AA lines.
+ */
+void
+draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
+{
+ struct aaline_stage *aaline;
+
+ /*
+ * Create / install AA line drawing / prim stage
+ */
+ aaline = draw_aaline_stage( draw );
+ assert(aaline);
+ draw->pipeline.aaline = &aaline->stage;
+
+ aaline->pipe = pipe;
+
+ /* create special texture, sampler state */
+ aaline_create_texture(aaline);
+ aaline_create_sampler(aaline);
+
+ /* save original driver functions */
+ aaline->driver_create_fs_state = pipe->create_fs_state;
+ aaline->driver_bind_fs_state = pipe->bind_fs_state;
+ aaline->driver_delete_fs_state = pipe->delete_fs_state;
+
+ aaline->driver_bind_sampler_state = pipe->bind_sampler_state;
+ aaline->driver_set_sampler_texture = pipe->set_sampler_texture;
+
+ /* override the driver's functions */
+ pipe->create_fs_state = aaline_create_fs_state;
+ pipe->bind_fs_state = aaline_bind_fs_state;
+ pipe->delete_fs_state = aaline_delete_fs_state;
+
+ pipe->bind_sampler_state = aaline_bind_sampler_state;
+ pipe->set_sampler_texture = aaline_set_sampler_texture;
+
+ add_aa_pipe_context(pipe, aaline);
+}
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