summaryrefslogtreecommitdiff
path: root/src/mesa/state_tracker/st_cb_clear.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mesa/state_tracker/st_cb_clear.c')
-rw-r--r--src/mesa/state_tracker/st_cb_clear.c495
1 files changed, 495 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
new file mode 100644
index 0000000000..8a8c99f7e1
--- /dev/null
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -0,0 +1,495 @@
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * Copyright 2009 VMware, Inc. 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
+ * Michel Dänzer
+ */
+
+#include "main/glheader.h"
+#include "main/macros.h"
+#include "shader/prog_instruction.h"
+#include "st_context.h"
+#include "st_atom.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 "st_inlines.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.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"
+
+
+void
+st_init_clear(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+
+ memset(&st->clear.raster, 0, sizeof(st->clear.raster));
+ st->clear.raster.gl_rasterization_rules = 1;
+
+ /* rasterizer state: bypass vertex shader, clipping and viewport */
+ st->clear.raster.bypass_vs_clip_and_viewport = 1;
+
+ /* fragment shader state: color pass-through program */
+ st->clear.fs =
+ util_make_fragment_passthrough_shader(pipe);
+
+ /* vertex shader state: color/position pass-through */
+ {
+ 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);
+ }
+}
+
+
+void
+st_destroy_clear(struct st_context *st)
+{
+ if (st->clear.fs) {
+ cso_delete_fragment_shader(st->cso_context, st->clear.fs);
+ st->clear.fs = NULL;
+ }
+ if (st->clear.vs) {
+ cso_delete_vertex_shader(st->cso_context, st->clear.vs);
+ st->clear.vs = NULL;
+ }
+ if (st->clear.vbuf) {
+ pipe_buffer_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf = NULL;
+ }
+}
+
+
+/**
+ * Draw a screen-aligned quadrilateral.
+ * Coords are window coords with y=0=bottom. These will be passed
+ * through unmodified to the rasterizer as we have set
+ * rasterizer->bypass_vs_clip_and_viewport.
+ */
+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;
+ const GLuint max_slots = 1024 / sizeof(st->clear.vertices);
+ GLuint i;
+
+ if (st->clear.vbuf_slot >= max_slots) {
+ pipe_buffer_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf_slot = 0;
+ }
+
+ if (!st->clear.vbuf) {
+ st->clear.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
+ max_slots * 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 */
+ st_no_flush_pipe_buffer_write(st, st->clear.vbuf,
+ st->clear.vbuf_slot * sizeof(st->clear.vertices),
+ sizeof(st->clear.vertices),
+ st->clear.vertices);
+
+ /* draw */
+ util_draw_vertex_buffer(pipe,
+ st->clear.vbuf,
+ st->clear.vbuf_slot * sizeof(st->clear.vertices),
+ PIPE_PRIM_TRIANGLE_FAN,
+ 4, /* verts */
+ 2); /* attribs/vert */
+
+ /* Increment slot */
+ st->clear.vbuf_slot++;
+}
+
+
+
+/**
+ * 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;
+ const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin;
+ const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax;
+ GLfloat y0, y1;
+
+ if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+ y0 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax);
+ y1 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin);
+ }
+ else {
+ y0 = (GLfloat) ctx->DrawBuffer->_Ymin;
+ y1 = (GLfloat) 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_fragment_shader(st->cso_context);
+ cso_save_vertex_shader(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].valuemask = 0xff;
+ depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
+ }
+
+ cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
+ }
+
+ cso_set_rasterizer(st->cso_context, &st->clear.raster);
+
+ cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
+ cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
+
+ /* draw quad matching scissor rect (XXX verify coord round-off) */
+ draw_quad(ctx, x0, y0, x1, y1, (GLfloat) 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_fragment_shader(st->cso_context);
+ cso_restore_vertex_shader(st->cso_context);
+}
+
+
+/**
+ * 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)
+{
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ 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 GLuint stencilMax = (1 << rb->StencilBits) - 1;
+ GLboolean maskStencil
+ = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ 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 = pf_is_depth_and_stencil(strb->surface->format);
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ return TRUE;
+
+ if (isDS &&
+ 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 = pf_is_depth_and_stencil(strb->surface->format);
+ const GLuint stencilMax = (1 << rb->StencilBits) - 1;
+ const GLboolean maskStencil
+ = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+ if (maskStencil)
+ return TRUE;
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ 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 &&
+ ctx->DrawBuffer->Visual.depthBits > 0)
+ return TRUE;
+
+ return FALSE;
+}
+
+
+
+void st_flush_clear( struct st_context *st )
+{
+ /* Release vertex buffer to avoid synchronous rendering if we were
+ * to map it in the next frame.
+ */
+ pipe_buffer_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf_slot = 0;
+}
+
+
+
+/**
+ * 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 quad_buffers = 0;
+ GLbitfield clear_buffers = 0;
+ GLuint i;
+
+ /* This makes sure the pipe has the latest scissor, etc values */
+ st_validate_state( st );
+
+ if (mask & BUFFER_BITS_COLOR) {
+ for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
+ GLuint b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
+
+ if (mask & (1 << b)) {
+ struct gl_renderbuffer *rb
+ = ctx->DrawBuffer->Attachment[b].Renderbuffer;
+ struct st_renderbuffer *strb;
+
+ assert(rb);
+
+ strb = st_renderbuffer(rb);
+
+ if (!strb->surface)
+ continue;
+
+ if (check_clear_color_with_quad( ctx, rb ))
+ quad_buffers |= PIPE_CLEAR_COLOR;
+ else
+ clear_buffers |= PIPE_CLEAR_COLOR;
+ }
+ }
+ }
+
+ if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
+ /* clearing combined depth + stencil */
+ struct st_renderbuffer *strb = st_renderbuffer(depthRb);
+
+ if (strb->surface) {
+ if (check_clear_depth_stencil_with_quad(ctx, depthRb))
+ quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ else
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ }
+ }
+ else {
+ /* separate depth/stencil clears */
+ if (mask & BUFFER_BIT_DEPTH) {
+ struct st_renderbuffer *strb = st_renderbuffer(depthRb);
+
+ if (strb->surface) {
+ if (check_clear_depth_with_quad(ctx, depthRb))
+ quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ else
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ }
+ }
+ if (mask & BUFFER_BIT_STENCIL) {
+ struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
+
+ if (strb->surface) {
+ if (check_clear_stencil_with_quad(ctx, stencilRb))
+ quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ else
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ }
+ }
+ }
+
+ /*
+ * If we're going to use clear_with_quad() for any reason, use it for
+ * everything possible.
+ */
+ if (quad_buffers) {
+ quad_buffers |= clear_buffers;
+ clear_with_quad(ctx,
+ quad_buffers & PIPE_CLEAR_COLOR,
+ mask & BUFFER_BIT_DEPTH,
+ mask & BUFFER_BIT_STENCIL);
+ } else if (clear_buffers)
+ ctx->st->pipe->clear(ctx->st->pipe, clear_buffers, ctx->Color.ClearColor,
+ ctx->Depth.Clear, ctx->Stencil.Clear);
+
+ if (mask & BUFFER_BIT_ACCUM)
+ st_clear_accum_buffer(ctx,
+ ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+}
+
+
+void st_init_clear_functions(struct dd_function_table *functions)
+{
+ functions->Clear = st_clear;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-29 08:24:37 +0000