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/**************************************************************************
*
* 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Brian Paul
*/
#include "main/glheader.h"
#include "main/macros.h"
#include "shader/prog_instruction.h"
#include "st_atom.h"
#include "st_context.h"
#include "st_cb_accum.h"
#include "st_cb_clear.h"
#include "st_cb_fbo.h"
#include "st_draw.h"
#include "st_program.h"
#include "st_public.h"
#include "st_mesa_to_tgsi.h"
#include "pipe/p_context.h"
#include "pipe/p_state.h"
#include "pipe/p_defines.h"
#include "pipe/p_winsys.h"
#include "util/u_pack_color.h"
#include "util/u_simple_shaders.h"
#include "util/u_draw_quad.h"
#include "cso_cache/cso_context.h"
/* XXX for testing draw module vertex passthrough: */
/* XXX this hack is broken now */
#define TEST_DRAW_PASSTHROUGH 0
void
st_destroy_clear(struct st_context *st)
{
struct pipe_context *pipe = st->pipe;
if (st->clear.fs) {
pipe->delete_fs_state(pipe, st->clear.fs);
st->clear.fs = NULL;
}
if (st->clear.vs) {
pipe->delete_vs_state(pipe, st->clear.vs);
st->clear.vs = NULL;
}
if (st->clear.vbuf) {
pipe->winsys->buffer_destroy(pipe->winsys, st->clear.vbuf);
st->clear.vbuf = NULL;
}
}
static GLboolean
is_depth_stencil_format(enum pipe_format pipeFormat)
{
switch (pipeFormat) {
case PIPE_FORMAT_S8Z24_UNORM:
case PIPE_FORMAT_Z24S8_UNORM:
return GL_TRUE;
default:
return GL_FALSE;
}
}
/**
* Draw a screen-aligned quadrilateral.
* Coords are window coords with y=0=bottom. These coords will be transformed
* by the vertex shader and viewport transform (which will flip Y if needed).
*/
static void
draw_quad(GLcontext *ctx,
float x0, float y0, float x1, float y1, GLfloat z,
const GLfloat color[4])
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = st->pipe;
GLuint i;
void *buf;
if (!st->clear.vbuf) {
st->clear.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
PIPE_BUFFER_USAGE_VERTEX,
sizeof(st->clear.vertices));
}
/* positions */
st->clear.vertices[0][0][0] = x0;
st->clear.vertices[0][0][1] = y0;
st->clear.vertices[1][0][0] = x1;
st->clear.vertices[1][0][1] = y0;
st->clear.vertices[2][0][0] = x1;
st->clear.vertices[2][0][1] = y1;
st->clear.vertices[3][0][0] = x0;
st->clear.vertices[3][0][1] = y1;
/* same for all verts: */
for (i = 0; i < 4; i++) {
st->clear.vertices[i][0][2] = z;
st->clear.vertices[i][0][3] = 1.0;
st->clear.vertices[i][1][0] = color[0];
st->clear.vertices[i][1][1] = color[1];
st->clear.vertices[i][1][2] = color[2];
st->clear.vertices[i][1][3] = color[3];
}
/* put vertex data into vbuf */
buf = pipe->winsys->buffer_map(pipe->winsys, st->clear.vbuf,
PIPE_BUFFER_USAGE_CPU_WRITE);
memcpy(buf, st->clear.vertices, sizeof(st->clear.vertices));
pipe->winsys->buffer_unmap(pipe->winsys, st->clear.vbuf);
/* draw */
util_draw_vertex_buffer(pipe, st->clear.vbuf,
PIPE_PRIM_TRIANGLE_FAN,
4, /* verts */
2); /* attribs/vert */
}
/**
* Do glClear by drawing a quadrilateral.
* The vertices of the quad will be computed from the
* ctx->DrawBuffer->_X/Ymin/max fields.
*/
static void
clear_with_quad(GLcontext *ctx,
GLboolean color, GLboolean depth, GLboolean stencil)
{
struct st_context *st = ctx->st;
struct pipe_context *pipe = st->pipe;
const GLfloat x0 = ctx->DrawBuffer->_Xmin;
const GLfloat y0 = ctx->DrawBuffer->_Ymin;
const GLfloat x1 = ctx->DrawBuffer->_Xmax;
const GLfloat y1 = ctx->DrawBuffer->_Ymax;
/*
printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
color ? "color, " : "",
depth ? "depth, " : "",
stencil ? "stencil" : "",
x0, y0,
x1, y1);
*/
cso_save_blend(st->cso_context);
cso_save_depth_stencil_alpha(st->cso_context);
cso_save_rasterizer(st->cso_context);
cso_save_viewport(st->cso_context);
/* blend state: RGBA masking */
{
struct pipe_blend_state blend;
memset(&blend, 0, sizeof(blend));
blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
if (color) {
if (ctx->Color.ColorMask[0])
blend.colormask |= PIPE_MASK_R;
if (ctx->Color.ColorMask[1])
blend.colormask |= PIPE_MASK_G;
if (ctx->Color.ColorMask[2])
blend.colormask |= PIPE_MASK_B;
if (ctx->Color.ColorMask[3])
blend.colormask |= PIPE_MASK_A;
if (st->ctx->Color.DitherFlag)
blend.dither = 1;
}
cso_set_blend(st->cso_context, &blend);
}
/* depth_stencil state: always pass/set to ref value */
{
struct pipe_depth_stencil_alpha_state depth_stencil;
memset(&depth_stencil, 0, sizeof(depth_stencil));
if (depth) {
depth_stencil.depth.enabled = 1;
depth_stencil.depth.writemask = 1;
depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
}
if (stencil) {
depth_stencil.stencil[0].enabled = 1;
depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
depth_stencil.stencil[0].ref_value = ctx->Stencil.Clear;
depth_stencil.stencil[0].value_mask = 0xff;
depth_stencil.stencil[0].write_mask = ctx->Stencil.WriteMask[0] & 0xff;
}
cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
}
/* rasterizer state: bypass clipping */
{
struct pipe_rasterizer_state raster;
memset(&raster, 0, sizeof(raster));
raster.bypass_clipping = 1;
#if TEST_DRAW_PASSTHROUGH
raster.bypass_vs = 1;
#endif
cso_set_rasterizer(st->cso_context, &raster);
}
/* fragment shader state: color pass-through program */
if (!st->clear.fs) {
st->clear.fs = util_make_fragment_passthrough_shader(pipe);
}
pipe->bind_fs_state(pipe, st->clear.fs);
#if !TEST_DRAW_PASSTHROUGH
/* vertex shader state: color/position pass-through */
if (!st->clear.vs) {
const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
TGSI_SEMANTIC_COLOR };
const uint semantic_indexes[] = { 0, 0 };
st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
semantic_names,
semantic_indexes);
}
pipe->bind_vs_state(pipe, st->clear.vs);
#endif
#if !TEST_DRAW_PASSTHROUGH
/* viewport state: viewport matching window dims */
{
const float width = ctx->DrawBuffer->Width;
const float height = ctx->DrawBuffer->Height;
struct pipe_viewport_state vp;
vp.scale[0] = 0.5 * width;
vp.scale[1] = -0.5 * height;
vp.scale[2] = 1.0;
vp.scale[3] = 1.0;
vp.translate[0] = 0.5 * width;
vp.translate[1] = 0.5 * height;
vp.translate[2] = 0.0;
vp.translate[3] = 0.0;
cso_set_viewport(st->cso_context, &vp);
}
#endif
/* draw quad matching scissor rect (XXX verify coord round-off) */
draw_quad(ctx, x0, y0, x1, y1, ctx->Depth.Clear, ctx->Color.ClearColor);
/* Restore pipe state */
cso_restore_blend(st->cso_context);
cso_restore_depth_stencil_alpha(st->cso_context);
cso_restore_rasterizer(st->cso_context);
cso_restore_viewport(st->cso_context);
/* these don't go through cso yet */
pipe->bind_fs_state(pipe, st->fp->driver_shader);
pipe->bind_vs_state(pipe, st->vp->driver_shader);
}
/**
* Determine if we need to clear the depth buffer by drawing a quad.
*/
static INLINE GLboolean
check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const struct st_renderbuffer *strb = st_renderbuffer(rb);
if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
return FALSE;
if (ctx->Scissor.Enabled)
return TRUE;
if (!ctx->Color.ColorMask[0] ||
!ctx->Color.ColorMask[1] ||
!ctx->Color.ColorMask[2] ||
!ctx->Color.ColorMask[3])
return TRUE;
return FALSE;
}
static INLINE GLboolean
check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const struct st_renderbuffer *strb = st_renderbuffer(rb);
const GLuint stencilMax = (1 << rb->StencilBits) - 1;
GLboolean maskStencil
= (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
return FALSE;
if (ctx->Scissor.Enabled)
return TRUE;
if (maskStencil)
return TRUE;
return FALSE;
}
/**
* Determine if we need to clear the depth buffer by drawing a quad.
*/
static INLINE GLboolean
check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const struct st_renderbuffer *strb = st_renderbuffer(rb);
const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
return FALSE;
if (ctx->Scissor.Enabled)
return TRUE;
if (isDS &&
strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
ctx->DrawBuffer->Visual.stencilBits > 0)
return TRUE;
return FALSE;
}
/**
* Determine if we need to clear the stencil buffer by drawing a quad.
*/
static INLINE GLboolean
check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const struct st_renderbuffer *strb = st_renderbuffer(rb);
const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
const GLuint stencilMax = (1 << rb->StencilBits) - 1;
const GLboolean maskStencil
= (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
return FALSE;
if (maskStencil)
return TRUE;
if (ctx->Scissor.Enabled)
return TRUE;
/* This is correct, but it is necessary to look at the depth clear
* value held in the surface when it comes time to issue the clear,
* rather than taking depth and stencil clear values from the
* current state.
*/
if (isDS &&
strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
ctx->DrawBuffer->Visual.depthBits > 0)
return TRUE;
return FALSE;
}
static void
clear_color_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
{
if (check_clear_color_with_quad( ctx, rb )) {
/* masking or scissoring */
clear_with_quad(ctx, GL_TRUE, GL_FALSE, GL_FALSE);
}
else {
/* clear whole buffer w/out masking */
struct st_renderbuffer *strb = st_renderbuffer(rb);
uint clearValue;
util_pack_color(ctx->Color.ClearColor, strb->surface->format, &clearValue);
ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
}
}
static void
clear_depth_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
{
if (check_clear_depth_with_quad(ctx, rb)) {
/* scissoring or we have a combined depth/stencil buffer */
clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_FALSE);
}
else {
struct st_renderbuffer *strb = st_renderbuffer(rb);
/* simple clear of whole buffer */
uint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
}
}
static void
clear_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
{
if (check_clear_stencil_with_quad(ctx, rb)) {
/* masking or scissoring or combined depth/stencil buffer */
clear_with_quad(ctx, GL_FALSE, GL_FALSE, GL_TRUE);
}
else {
struct st_renderbuffer *strb = st_renderbuffer(rb);
/* simple clear of whole buffer */
GLuint clearValue = ctx->Stencil.Clear;
switch (strb->surface->format) {
case PIPE_FORMAT_S8Z24_UNORM:
clearValue <<= 24;
break;
default:
; /* no-op, stencil value is in least significant bits */
}
ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
}
}
static void
clear_depth_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
{
if (check_clear_depth_stencil_with_quad(ctx, rb)) {
/* masking or scissoring */
clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_TRUE);
}
else {
struct st_renderbuffer *strb = st_renderbuffer(rb);
/* clear whole buffer w/out masking */
GLuint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
switch (strb->surface->format) {
case PIPE_FORMAT_S8Z24_UNORM:
clearValue |= ctx->Stencil.Clear << 24;
break;
case PIPE_FORMAT_Z24S8_UNORM:
clearValue |= ctx->Stencil.Clear;
break;
default:
assert(0);
}
ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
}
}
/**
* Called via ctx->Driver.Clear()
* XXX: doesn't pick up the differences between front/back/left/right
* clears. Need to sort that out...
*/
static void st_clear(GLcontext *ctx, GLbitfield mask)
{
static const GLbitfield BUFFER_BITS_DS
= (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
struct st_context *st = ctx->st;
struct gl_renderbuffer *depthRb
= ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
struct gl_renderbuffer *stencilRb
= ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
GLbitfield cmask = mask & BUFFER_BITS_COLOR;
/* This makes sure the softpipe has the latest scissor, etc values */
st_validate_state( st );
/*
* XXX TO-DO:
* If we're going to use clear_with_quad() for any reason, use it to
* clear as many other buffers as possible.
* As it is now, we sometimes call clear_with_quad() three times to clear
* color/depth/stencil individually...
*/
if (cmask) {
GLuint b;
for (b = 0; cmask; b++) {
if (cmask & (1 << b)) {
struct gl_renderbuffer *rb
= ctx->DrawBuffer->Attachment[b].Renderbuffer;
assert(rb);
clear_color_buffer(ctx, rb);
cmask &= ~(1 << b); /* turn off bit */
}
assert(b < BUFFER_COUNT);
}
}
if (mask & BUFFER_BIT_ACCUM) {
st_clear_accum_buffer(ctx,
ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
}
if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
/* clearing combined depth + stencil */
clear_depth_stencil_buffer(ctx, depthRb);
}
else {
/* separate depth/stencil clears */
if (mask & BUFFER_BIT_DEPTH) {
clear_depth_buffer(ctx, depthRb);
}
if (mask & BUFFER_BIT_STENCIL) {
clear_stencil_buffer(ctx, stencilRb);
}
}
}
void st_init_clear_functions(struct dd_function_table *functions)
{
functions->Clear = st_clear;
}
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