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-rw-r--r--shared/intel_clear.c393
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diff --git a/shared/intel_clear.c b/shared/intel_clear.c
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+++ b/shared/intel_clear.c
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+/**************************************************************************
+ *
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2009 Intel Corporation.
+ * 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.
+ *
+ **************************************************************************/
+
+#include "main/glheader.h"
+#include "main/enums.h"
+#include "main/image.h"
+#include "main/mtypes.h"
+#include "main/attrib.h"
+#include "main/blend.h"
+#include "main/bufferobj.h"
+#include "main/buffers.h"
+#include "main/depth.h"
+#include "main/enable.h"
+#include "main/macros.h"
+#include "main/matrix.h"
+#include "main/texstate.h"
+#include "main/shaders.h"
+#include "main/stencil.h"
+#include "main/varray.h"
+#include "glapi/dispatch.h"
+#include "swrast/swrast.h"
+
+#include "intel_context.h"
+#include "intel_blit.h"
+#include "intel_chipset.h"
+#include "intel_clear.h"
+#include "intel_fbo.h"
+#include "intel_pixel.h"
+
+#define FILE_DEBUG_FLAG DEBUG_BLIT
+
+#define TRI_CLEAR_COLOR_BITS (BUFFER_BIT_BACK_LEFT | \
+ BUFFER_BIT_FRONT_LEFT | \
+ BUFFER_BIT_COLOR0 | \
+ BUFFER_BIT_COLOR1 | \
+ BUFFER_BIT_COLOR2 | \
+ BUFFER_BIT_COLOR3 | \
+ BUFFER_BIT_COLOR4 | \
+ BUFFER_BIT_COLOR5 | \
+ BUFFER_BIT_COLOR6 | \
+ BUFFER_BIT_COLOR7)
+
+/**
+ * Perform glClear where mask contains only color, depth, and/or stencil.
+ *
+ * The implementation is based on calling into Mesa to set GL state and
+ * performing normal triangle rendering. The intent of this path is to
+ * have as generic a path as possible, so that any driver could make use of
+ * it.
+ */
+void
+intel_clear_tris(GLcontext *ctx, GLbitfield mask)
+{
+ struct intel_context *intel = intel_context(ctx);
+ GLfloat vertices[4][3];
+ GLfloat color[4][4];
+ GLfloat dst_z;
+ struct gl_framebuffer *fb = ctx->DrawBuffer;
+ int i;
+ GLboolean saved_fp_enable = GL_FALSE, saved_vp_enable = GL_FALSE;
+ GLuint saved_shader_program = 0;
+ unsigned int saved_active_texture;
+
+ assert((mask & ~(TRI_CLEAR_COLOR_BITS | BUFFER_BIT_DEPTH |
+ BUFFER_BIT_STENCIL)) == 0);
+
+ _mesa_PushAttrib(GL_COLOR_BUFFER_BIT |
+ GL_CURRENT_BIT |
+ GL_DEPTH_BUFFER_BIT |
+ GL_ENABLE_BIT |
+ GL_STENCIL_BUFFER_BIT |
+ GL_TRANSFORM_BIT |
+ GL_CURRENT_BIT);
+ _mesa_PushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
+ saved_active_texture = ctx->Texture.CurrentUnit;
+
+ /* Disable existing GL state we don't want to apply to a clear. */
+ _mesa_Disable(GL_ALPHA_TEST);
+ _mesa_Disable(GL_BLEND);
+ _mesa_Disable(GL_CULL_FACE);
+ _mesa_Disable(GL_FOG);
+ _mesa_Disable(GL_POLYGON_SMOOTH);
+ _mesa_Disable(GL_POLYGON_STIPPLE);
+ _mesa_Disable(GL_POLYGON_OFFSET_FILL);
+ _mesa_Disable(GL_LIGHTING);
+ _mesa_Disable(GL_CLIP_PLANE0);
+ _mesa_Disable(GL_CLIP_PLANE1);
+ _mesa_Disable(GL_CLIP_PLANE2);
+ _mesa_Disable(GL_CLIP_PLANE3);
+ _mesa_Disable(GL_CLIP_PLANE4);
+ _mesa_Disable(GL_CLIP_PLANE5);
+ if (ctx->Extensions.ARB_fragment_program && ctx->FragmentProgram.Enabled) {
+ saved_fp_enable = GL_TRUE;
+ _mesa_Disable(GL_FRAGMENT_PROGRAM_ARB);
+ }
+ if (ctx->Extensions.ARB_vertex_program && ctx->VertexProgram.Enabled) {
+ saved_vp_enable = GL_TRUE;
+ _mesa_Disable(GL_VERTEX_PROGRAM_ARB);
+ }
+ if (ctx->Extensions.ARB_shader_objects && ctx->Shader.CurrentProgram) {
+ saved_shader_program = ctx->Shader.CurrentProgram->Name;
+ _mesa_UseProgramObjectARB(0);
+ }
+
+ if (ctx->Texture._EnabledUnits != 0) {
+ int i;
+
+ for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
+ _mesa_ActiveTextureARB(GL_TEXTURE0 + i);
+ _mesa_Disable(GL_TEXTURE_1D);
+ _mesa_Disable(GL_TEXTURE_2D);
+ _mesa_Disable(GL_TEXTURE_3D);
+ if (ctx->Extensions.ARB_texture_cube_map)
+ _mesa_Disable(GL_TEXTURE_CUBE_MAP_ARB);
+ if (ctx->Extensions.NV_texture_rectangle)
+ _mesa_Disable(GL_TEXTURE_RECTANGLE_NV);
+ if (ctx->Extensions.MESA_texture_array) {
+ _mesa_Disable(GL_TEXTURE_1D_ARRAY_EXT);
+ _mesa_Disable(GL_TEXTURE_2D_ARRAY_EXT);
+ }
+ }
+ }
+
+ intel_meta_set_passthrough_transform(intel);
+
+ for (i = 0; i < 4; i++) {
+ color[i][0] = ctx->Color.ClearColor[0];
+ color[i][1] = ctx->Color.ClearColor[1];
+ color[i][2] = ctx->Color.ClearColor[2];
+ color[i][3] = ctx->Color.ClearColor[3];
+ }
+
+ /* convert clear Z from [0,1] to NDC coord in [-1,1] */
+ dst_z = -1.0 + 2.0 * ctx->Depth.Clear;
+
+ /* Prepare the vertices, which are the same regardless of which buffer we're
+ * drawing to.
+ */
+ vertices[0][0] = fb->_Xmin;
+ vertices[0][1] = fb->_Ymin;
+ vertices[0][2] = dst_z;
+ vertices[1][0] = fb->_Xmax;
+ vertices[1][1] = fb->_Ymin;
+ vertices[1][2] = dst_z;
+ vertices[2][0] = fb->_Xmax;
+ vertices[2][1] = fb->_Ymax;
+ vertices[2][2] = dst_z;
+ vertices[3][0] = fb->_Xmin;
+ vertices[3][1] = fb->_Ymax;
+ vertices[3][2] = dst_z;
+
+ _mesa_ColorPointer(4, GL_FLOAT, 4 * sizeof(GLfloat), &color);
+ _mesa_VertexPointer(3, GL_FLOAT, 3 * sizeof(GLfloat), &vertices);
+ _mesa_Enable(GL_COLOR_ARRAY);
+ _mesa_Enable(GL_VERTEX_ARRAY);
+
+ while (mask != 0) {
+ GLuint this_mask = 0;
+ GLuint color_bit;
+
+ color_bit = _mesa_ffs(mask & TRI_CLEAR_COLOR_BITS);
+ if (color_bit != 0)
+ this_mask |= (1 << (color_bit - 1));
+
+ /* Clear depth/stencil in the same pass as color. */
+ this_mask |= (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL));
+
+ /* Select the current color buffer and use the color write mask if
+ * we have one, otherwise don't write any color channels.
+ */
+ if (this_mask & BUFFER_BIT_FRONT_LEFT)
+ _mesa_DrawBuffer(GL_FRONT_LEFT);
+ else if (this_mask & BUFFER_BIT_BACK_LEFT)
+ _mesa_DrawBuffer(GL_BACK_LEFT);
+ else if (color_bit != 0)
+ _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0 +
+ (color_bit - BUFFER_COLOR0 - 1));
+ else
+ _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+
+ /* Control writing of the depth clear value to depth. */
+ if (this_mask & BUFFER_BIT_DEPTH) {
+ _mesa_DepthFunc(GL_ALWAYS);
+ _mesa_Enable(GL_DEPTH_TEST);
+ } else {
+ _mesa_Disable(GL_DEPTH_TEST);
+ _mesa_DepthMask(GL_FALSE);
+ }
+
+ /* Control writing of the stencil clear value to stencil. */
+ if (this_mask & BUFFER_BIT_STENCIL) {
+ _mesa_Enable(GL_STENCIL_TEST);
+ _mesa_StencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
+ _mesa_StencilFuncSeparate(GL_FRONT, GL_ALWAYS, ctx->Stencil.Clear,
+ ctx->Stencil.WriteMask[0]);
+ } else {
+ _mesa_Disable(GL_STENCIL_TEST);
+ }
+
+ CALL_DrawArrays(ctx->Exec, (GL_TRIANGLE_FAN, 0, 4));
+
+ mask &= ~this_mask;
+ }
+
+ intel_meta_restore_transform(intel);
+
+ _mesa_ActiveTextureARB(GL_TEXTURE0 + saved_active_texture);
+ if (saved_fp_enable)
+ _mesa_Enable(GL_FRAGMENT_PROGRAM_ARB);
+ if (saved_vp_enable)
+ _mesa_Enable(GL_VERTEX_PROGRAM_ARB);
+
+ if (saved_shader_program)
+ _mesa_UseProgramObjectARB(saved_shader_program);
+
+ _mesa_PopClientAttrib();
+ _mesa_PopAttrib();
+}
+
+static const char *buffer_names[] = {
+ [BUFFER_FRONT_LEFT] = "front",
+ [BUFFER_BACK_LEFT] = "back",
+ [BUFFER_FRONT_RIGHT] = "front right",
+ [BUFFER_BACK_RIGHT] = "back right",
+ [BUFFER_AUX0] = "aux0",
+ [BUFFER_AUX1] = "aux1",
+ [BUFFER_AUX2] = "aux2",
+ [BUFFER_AUX3] = "aux3",
+ [BUFFER_DEPTH] = "depth",
+ [BUFFER_STENCIL] = "stencil",
+ [BUFFER_ACCUM] = "accum",
+ [BUFFER_COLOR0] = "color0",
+ [BUFFER_COLOR1] = "color1",
+ [BUFFER_COLOR2] = "color2",
+ [BUFFER_COLOR3] = "color3",
+ [BUFFER_COLOR4] = "color4",
+ [BUFFER_COLOR5] = "color5",
+ [BUFFER_COLOR6] = "color6",
+ [BUFFER_COLOR7] = "color7",
+};
+
+/**
+ * Called by ctx->Driver.Clear.
+ */
+static void
+intelClear(GLcontext *ctx, GLbitfield mask)
+{
+ struct intel_context *intel = intel_context(ctx);
+ const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
+ GLbitfield tri_mask = 0;
+ GLbitfield blit_mask = 0;
+ GLbitfield swrast_mask = 0;
+ struct gl_framebuffer *fb = ctx->DrawBuffer;
+ GLuint i;
+
+ if (0)
+ fprintf(stderr, "%s\n", __FUNCTION__);
+
+ /* HW color buffers (front, back, aux, generic FBO, etc) */
+ if (colorMask == ~0) {
+ /* clear all R,G,B,A */
+ /* XXX FBO: need to check if colorbuffers are software RBOs! */
+ blit_mask |= (mask & BUFFER_BITS_COLOR);
+ }
+ else {
+ /* glColorMask in effect */
+ tri_mask |= (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT));
+ }
+
+ /* HW stencil */
+ if (mask & BUFFER_BIT_STENCIL) {
+ const struct intel_region *stencilRegion
+ = intel_get_rb_region(fb, BUFFER_STENCIL);
+ if (stencilRegion) {
+ /* have hw stencil */
+ if (IS_965(intel->intelScreen->deviceID) ||
+ (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
+ /* We have to use the 3D engine if we're clearing a partial mask
+ * of the stencil buffer, or if we're on a 965 which has a tiled
+ * depth/stencil buffer in a layout we can't blit to.
+ */
+ tri_mask |= BUFFER_BIT_STENCIL;
+ }
+ else {
+ /* clearing all stencil bits, use blitting */
+ blit_mask |= BUFFER_BIT_STENCIL;
+ }
+ }
+ }
+
+ /* HW depth */
+ if (mask & BUFFER_BIT_DEPTH) {
+ /* clear depth with whatever method is used for stencil (see above) */
+ if (IS_965(intel->intelScreen->deviceID) ||
+ tri_mask & BUFFER_BIT_STENCIL)
+ tri_mask |= BUFFER_BIT_DEPTH;
+ else
+ blit_mask |= BUFFER_BIT_DEPTH;
+ }
+
+ /* If we're doing a tri pass for depth/stencil, include a likely color
+ * buffer with it.
+ */
+ if (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL)) {
+ int color_bit = _mesa_ffs(mask & TRI_CLEAR_COLOR_BITS);
+ if (color_bit != 0) {
+ tri_mask |= blit_mask & (1 << (color_bit - 1));
+ blit_mask &= ~(1 << (color_bit - 1));
+ }
+ }
+
+ /* SW fallback clearing */
+ swrast_mask = mask & ~tri_mask & ~blit_mask;
+
+ for (i = 0; i < BUFFER_COUNT; i++) {
+ GLuint bufBit = 1 << i;
+ if ((blit_mask | tri_mask) & bufBit) {
+ if (!fb->Attachment[i].Renderbuffer->ClassID) {
+ blit_mask &= ~bufBit;
+ tri_mask &= ~bufBit;
+ swrast_mask |= bufBit;
+ }
+ }
+ }
+
+ if (blit_mask) {
+ if (INTEL_DEBUG & DEBUG_BLIT) {
+ DBG("blit clear:");
+ for (i = 0; i < BUFFER_COUNT; i++) {
+ if (blit_mask & (1 << i))
+ DBG(" %s", buffer_names[i]);
+ }
+ DBG("\n");
+ }
+ intelClearWithBlit(ctx, blit_mask);
+ }
+
+ if (tri_mask) {
+ if (INTEL_DEBUG & DEBUG_BLIT) {
+ DBG("tri clear:");
+ for (i = 0; i < BUFFER_COUNT; i++) {
+ if (tri_mask & (1 << i))
+ DBG(" %s", buffer_names[i]);
+ }
+ DBG("\n");
+ }
+ intel_clear_tris(ctx, tri_mask);
+ }
+
+ if (swrast_mask) {
+ if (INTEL_DEBUG & DEBUG_BLIT) {
+ DBG("swrast clear:");
+ for (i = 0; i < BUFFER_COUNT; i++) {
+ if (swrast_mask & (1 << i))
+ DBG(" %s", buffer_names[i]);
+ }
+ DBG("\n");
+ }
+ _swrast_Clear(ctx, swrast_mask);
+ }
+}
+
+
+void
+intelInitClearFuncs(struct dd_function_table *functions)
+{
+ functions->Clear = intelClear;
+}
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