src/mesa/drivers/dri/i965/gen6_cc.c - platform/external/mesa3d - Git at Google

 /*
  * Copyright © 2009 Intel Corporation
  *
  * 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, sublicense,
  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS 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:
  *    Eric Anholt <eric@anholt.net>
  *
  */

 #include "brw_context.h"
 #include "brw_state.h"
 #include "brw_defines.h"
 #include "brw_util.h"
 #include "intel_batchbuffer.h"
 #include "main/macros.h"

 static void
 gen6_upload_blend_state(struct brw_context *brw)
 {
    bool is_buffer_zero_integer_format = false;
    struct gl_context *ctx = &brw->intel.ctx;
    struct gen6_blend_state *blend;
    int b;
    int nr_draw_buffers = ctx->DrawBuffer->_NumColorDrawBuffers;
    int size;

    /* We need at least one BLEND_STATE written, because we might do
     * thread dispatch even if _NumColorDrawBuffers is 0 (for example
     * for computed depth or alpha test), which will do an FB write
     * with render target 0, which will reference BLEND_STATE[0] for
     * alpha test enable.
     */
    if (nr_draw_buffers == 0 && ctx->Color.AlphaEnabled)
       nr_draw_buffers = 1;

    size = sizeof(*blend) * nr_draw_buffers;
    blend = brw_state_batch(brw, AUB_TRACE_BLEND_STATE,
 			   size, 64, &brw->cc.blend_state_offset);

    memset(blend, 0, size);

    for (b = 0; b < nr_draw_buffers; b++) {
       /* _NEW_BUFFERS */
       struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[b];
       GLenum rb_type;
       bool integer;

       if (rb)
 	 rb_type = _mesa_get_format_datatype(rb->Format);
       else
 	 rb_type = GL_UNSIGNED_NORMALIZED;

       /* Used for implementing the following bit of GL_EXT_texture_integer:
        *     "Per-fragment operations that require floating-point color
        *      components, including multisample alpha operations, alpha test,
        *      blending, and dithering, have no effect when the corresponding
        *      colors are written to an integer color buffer."
       */
       integer = (rb_type == GL_INT || rb_type == GL_UNSIGNED_INT);

       if(b == 0 && integer)
          is_buffer_zero_integer_format = true;

       /* _NEW_COLOR */
       if (ctx->Color.ColorLogicOpEnabled) {
 	 /* Floating point RTs should have no effect from LogicOp,
 	  * except for disabling of blending.
 	  *
 	  * From the Sandy Bridge PRM, Vol 2 Par 1, Section 8.1.11, "Logic Ops",
 	  *
 	  *     "Logic Ops are only supported on *_UNORM surfaces (excluding
 	  *      _SRGB variants), otherwise Logic Ops must be DISABLED."
 	  */
 	 if (rb_type == GL_UNSIGNED_NORMALIZED) {
 	    blend[b].blend1.logic_op_enable = 1;
 	    blend[b].blend1.logic_op_func =
 	       intel_translate_logic_op(ctx->Color.LogicOp);
 	 }
       } else if (ctx->Color.BlendEnabled & (1 << b) && !integer) {
 	 GLenum eqRGB = ctx->Color.Blend[b].EquationRGB;
 	 GLenum eqA = ctx->Color.Blend[b].EquationA;
 	 GLenum srcRGB = ctx->Color.Blend[b].SrcRGB;
 	 GLenum dstRGB = ctx->Color.Blend[b].DstRGB;
 	 GLenum srcA = ctx->Color.Blend[b].SrcA;
 	 GLenum dstA = ctx->Color.Blend[b].DstA;

 	 if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 	    srcRGB = dstRGB = GL_ONE;
 	 }

 	 if (eqA == GL_MIN || eqA == GL_MAX) {
 	    srcA = dstA = GL_ONE;
 	 }

 	 blend[b].blend0.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 	 blend[b].blend0.source_blend_factor = brw_translate_blend_factor(srcRGB);
 	 blend[b].blend0.blend_func = brw_translate_blend_equation(eqRGB);

 	 blend[b].blend0.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 	 blend[b].blend0.ia_source_blend_factor = brw_translate_blend_factor(srcA);
 	 blend[b].blend0.ia_blend_func = brw_translate_blend_equation(eqA);

 	 blend[b].blend0.blend_enable = 1;
 	 blend[b].blend0.ia_blend_enable = (srcA != srcRGB ||
 					 dstA != dstRGB ||
 					 eqA != eqRGB);
       }

       /* See section 8.1.6 "Pre-Blend Color Clamping" of the
        * SandyBridge PRM Volume 2 Part 1 for HW requirements.
        *
        * We do our ARB_color_buffer_float CLAMP_FRAGMENT_COLOR
        * clamping in the fragment shader.  For its clamping of
        * blending, the spec says:
        *
        *     "RESOLVED: For fixed-point color buffers, the inputs and
        *      the result of the blending equation are clamped.  For
        *      floating-point color buffers, no clamping occurs."
        *
        * So, generally, we want clamping to the render target's range.
        * And, good news, the hardware tables for both pre- and
        * post-blend color clamping are either ignored, or any are
        * allowed, or clamping is required but RT range clamping is a
        * valid option.
        */
       blend[b].blend1.pre_blend_clamp_enable = 1;
       blend[b].blend1.post_blend_clamp_enable = 1;
       blend[b].blend1.clamp_range = BRW_RENDERTARGET_CLAMPRANGE_FORMAT;

       /* _NEW_COLOR */
       if (ctx->Color.AlphaEnabled && !integer) {
 	 blend[b].blend1.alpha_test_enable = 1;
 	 blend[b].blend1.alpha_test_func =
 	    intel_translate_compare_func(ctx->Color.AlphaFunc);

       }

       /* _NEW_COLOR */
       if (ctx->Color.DitherFlag && !integer) {
 	 blend[b].blend1.dither_enable = 1;
 	 blend[b].blend1.y_dither_offset = 0;
 	 blend[b].blend1.x_dither_offset = 0;
       }

       blend[b].blend1.write_disable_r = !ctx->Color.ColorMask[b][0];
       blend[b].blend1.write_disable_g = !ctx->Color.ColorMask[b][1];
       blend[b].blend1.write_disable_b = !ctx->Color.ColorMask[b][2];
       blend[b].blend1.write_disable_a = !ctx->Color.ColorMask[b][3];

       /* OpenGL specification 3.3 (page 196), section 4.1.3 says:
        * "If drawbuffer zero is not NONE and the buffer it references has an
        * integer format, the SAMPLE_ALPHA_TO_COVERAGE and SAMPLE_ALPHA_TO_ONE
        * operations are skipped."
        */
       if(!is_buffer_zero_integer_format) {
          /* _NEW_MULTISAMPLE */
          blend[b].blend1.alpha_to_coverage =
             ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToCoverage;

 	/* From SandyBridge PRM, volume 2 Part 1, section 8.2.3, BLEND_STATE:
 	 * DWord 1, Bit 30 (AlphaToOne Enable):
 	 * "If Dual Source Blending is enabled, this bit must be disabled"
 	 */
 	 if (ctx->Color.Blend[b]._UsesDualSrc)
             blend[b].blend1.alpha_to_one = false;
 	 else
 	    blend[b].blend1.alpha_to_one =
 	       ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToOne;

          blend[b].blend1.alpha_to_coverage_dither = (brw->intel.gen >= 7);
       }
       else {
          blend[b].blend1.alpha_to_coverage = false;
          blend[b].blend1.alpha_to_one = false;
       }
    }

    brw->state.dirty.cache |= CACHE_NEW_BLEND_STATE;
 }

 const struct brw_tracked_state gen6_blend_state = {
    .dirty = {
       .mesa = (_NEW_COLOR |
                _NEW_BUFFERS |
                _NEW_MULTISAMPLE),
       .brw = BRW_NEW_BATCH,
       .cache = 0,
    },
    .emit = gen6_upload_blend_state,
 };

 static void
 gen6_upload_color_calc_state(struct brw_context *brw)
 {
    struct gl_context *ctx = &brw->intel.ctx;
    struct gen6_color_calc_state *cc;

    cc = brw_state_batch(brw, AUB_TRACE_CC_STATE,
 			sizeof(*cc), 64, &brw->cc.state_offset);
    memset(cc, 0, sizeof(*cc));

    /* _NEW_COLOR */
    cc->cc0.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
    UNCLAMPED_FLOAT_TO_UBYTE(cc->cc1.alpha_ref_fi.ui, ctx->Color.AlphaRef);

    /* _NEW_STENCIL */
    cc->cc0.stencil_ref = ctx->Stencil.Ref[0];
    cc->cc0.bf_stencil_ref = ctx->Stencil.Ref[ctx->Stencil._BackFace];

    /* _NEW_COLOR */
    cc->constant_r = ctx->Color.BlendColorUnclamped[0];
    cc->constant_g = ctx->Color.BlendColorUnclamped[1];
    cc->constant_b = ctx->Color.BlendColorUnclamped[2];
    cc->constant_a = ctx->Color.BlendColorUnclamped[3];

    brw->state.dirty.cache |= CACHE_NEW_COLOR_CALC_STATE;
 }

 const struct brw_tracked_state gen6_color_calc_state = {
    .dirty = {
       .mesa = _NEW_COLOR | _NEW_STENCIL,
       .brw = BRW_NEW_BATCH,
       .cache = 0,
    },
    .emit = gen6_upload_color_calc_state,
 };

 static void upload_cc_state_pointers(struct brw_context *brw)
 {
    struct intel_context *intel = &brw->intel;

    BEGIN_BATCH(4);
    OUT_BATCH(_3DSTATE_CC_STATE_POINTERS << 16 | (4 - 2));
    OUT_BATCH(brw->cc.blend_state_offset | 1);
    OUT_BATCH(brw->cc.depth_stencil_state_offset | 1);
    OUT_BATCH(brw->cc.state_offset | 1);
    ADVANCE_BATCH();
 }

 const struct brw_tracked_state gen6_cc_state_pointers = {
    .dirty = {
       .mesa = 0,
       .brw = (BRW_NEW_BATCH |
 	      BRW_NEW_STATE_BASE_ADDRESS),
       .cache = (CACHE_NEW_BLEND_STATE |
 		CACHE_NEW_COLOR_CALC_STATE |
 		CACHE_NEW_DEPTH_STENCIL_STATE)
    },
    .emit = upload_cc_state_pointers,
 };
	/*
	* Copyright © 2009 Intel Corporation
	*
	* 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, sublicense,
	* 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 NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS 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:
	* Eric Anholt <eric@anholt.net>
	*
	*/

	#include "brw_context.h"
	#include "brw_state.h"
	#include "brw_defines.h"
	#include "brw_util.h"
	#include "intel_batchbuffer.h"
	#include "main/macros.h"

	static void
	gen6_upload_blend_state(struct brw_context *brw)
	{
	bool is_buffer_zero_integer_format = false;
	struct gl_context *ctx = &brw->intel.ctx;
	struct gen6_blend_state *blend;
	int b;
	int nr_draw_buffers = ctx->DrawBuffer->_NumColorDrawBuffers;
	int size;

	/* We need at least one BLEND_STATE written, because we might do
	* thread dispatch even if _NumColorDrawBuffers is 0 (for example
	* for computed depth or alpha test), which will do an FB write
	* with render target 0, which will reference BLEND_STATE[0] for
	* alpha test enable.
	*/
	if (nr_draw_buffers == 0 && ctx->Color.AlphaEnabled)
	nr_draw_buffers = 1;

	size = sizeof(blend) nr_draw_buffers;
	blend = brw_state_batch(brw, AUB_TRACE_BLEND_STATE,
	size, 64, &brw->cc.blend_state_offset);

	memset(blend, 0, size);

	for (b = 0; b < nr_draw_buffers; b++) {
	/* _NEW_BUFFERS */
	struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[b];
	GLenum rb_type;
	bool integer;

	if (rb)
	rb_type = _mesa_get_format_datatype(rb->Format);
	else
	rb_type = GL_UNSIGNED_NORMALIZED;

	/* Used for implementing the following bit of GL_EXT_texture_integer:
	* "Per-fragment operations that require floating-point color
	* components, including multisample alpha operations, alpha test,
	* blending, and dithering, have no effect when the corresponding
	* colors are written to an integer color buffer."
	*/
	integer = (rb_type == GL_INT \|\| rb_type == GL_UNSIGNED_INT);

	if(b == 0 && integer)
	is_buffer_zero_integer_format = true;

	/* _NEW_COLOR */
	if (ctx->Color.ColorLogicOpEnabled) {
	/* Floating point RTs should have no effect from LogicOp,
	* except for disabling of blending.
	*
	* From the Sandy Bridge PRM, Vol 2 Par 1, Section 8.1.11, "Logic Ops",
	*
	* "Logic Ops are only supported on *_UNORM surfaces (excluding
	* _SRGB variants), otherwise Logic Ops must be DISABLED."
	*/
	if (rb_type == GL_UNSIGNED_NORMALIZED) {
	blend[b].blend1.logic_op_enable = 1;
	blend[b].blend1.logic_op_func =
	intel_translate_logic_op(ctx->Color.LogicOp);
	}
	} else if (ctx->Color.BlendEnabled & (1 << b) && !integer) {
	GLenum eqRGB = ctx->Color.Blend[b].EquationRGB;
	GLenum eqA = ctx->Color.Blend[b].EquationA;
	GLenum srcRGB = ctx->Color.Blend[b].SrcRGB;
	GLenum dstRGB = ctx->Color.Blend[b].DstRGB;
	GLenum srcA = ctx->Color.Blend[b].SrcA;
	GLenum dstA = ctx->Color.Blend[b].DstA;

	if (eqRGB == GL_MIN \|\| eqRGB == GL_MAX) {
	srcRGB = dstRGB = GL_ONE;
	}

	if (eqA == GL_MIN \|\| eqA == GL_MAX) {
	srcA = dstA = GL_ONE;
	}

	blend[b].blend0.dest_blend_factor = brw_translate_blend_factor(dstRGB);
	blend[b].blend0.source_blend_factor = brw_translate_blend_factor(srcRGB);
	blend[b].blend0.blend_func = brw_translate_blend_equation(eqRGB);

	blend[b].blend0.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
	blend[b].blend0.ia_source_blend_factor = brw_translate_blend_factor(srcA);
	blend[b].blend0.ia_blend_func = brw_translate_blend_equation(eqA);

	blend[b].blend0.blend_enable = 1;
	blend[b].blend0.ia_blend_enable = (srcA != srcRGB \|\|
	dstA != dstRGB \|\|
	eqA != eqRGB);
	}

	/* See section 8.1.6 "Pre-Blend Color Clamping" of the
	* SandyBridge PRM Volume 2 Part 1 for HW requirements.
	*
	* We do our ARB_color_buffer_float CLAMP_FRAGMENT_COLOR
	* clamping in the fragment shader. For its clamping of
	* blending, the spec says:
	*
	* "RESOLVED: For fixed-point color buffers, the inputs and
	* the result of the blending equation are clamped. For
	* floating-point color buffers, no clamping occurs."
	*
	* So, generally, we want clamping to the render target's range.
	* And, good news, the hardware tables for both pre- and
	* post-blend color clamping are either ignored, or any are
	* allowed, or clamping is required but RT range clamping is a
	* valid option.
	*/
	blend[b].blend1.pre_blend_clamp_enable = 1;
	blend[b].blend1.post_blend_clamp_enable = 1;
	blend[b].blend1.clamp_range = BRW_RENDERTARGET_CLAMPRANGE_FORMAT;

	/* _NEW_COLOR */
	if (ctx->Color.AlphaEnabled && !integer) {
	blend[b].blend1.alpha_test_enable = 1;
	blend[b].blend1.alpha_test_func =
	intel_translate_compare_func(ctx->Color.AlphaFunc);

	}

	/* _NEW_COLOR */
	if (ctx->Color.DitherFlag && !integer) {
	blend[b].blend1.dither_enable = 1;
	blend[b].blend1.y_dither_offset = 0;
	blend[b].blend1.x_dither_offset = 0;
	}

	blend[b].blend1.write_disable_r = !ctx->Color.ColorMask[b][0];
	blend[b].blend1.write_disable_g = !ctx->Color.ColorMask[b][1];
	blend[b].blend1.write_disable_b = !ctx->Color.ColorMask[b][2];
	blend[b].blend1.write_disable_a = !ctx->Color.ColorMask[b][3];

	/* OpenGL specification 3.3 (page 196), section 4.1.3 says:
	* "If drawbuffer zero is not NONE and the buffer it references has an
	* integer format, the SAMPLE_ALPHA_TO_COVERAGE and SAMPLE_ALPHA_TO_ONE
	* operations are skipped."
	*/
	if(!is_buffer_zero_integer_format) {
	/* _NEW_MULTISAMPLE */
	blend[b].blend1.alpha_to_coverage =
	ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToCoverage;

	/* From SandyBridge PRM, volume 2 Part 1, section 8.2.3, BLEND_STATE:
	* DWord 1, Bit 30 (AlphaToOne Enable):
	* "If Dual Source Blending is enabled, this bit must be disabled"
	*/
	if (ctx->Color.Blend[b]._UsesDualSrc)
	blend[b].blend1.alpha_to_one = false;
	else
	blend[b].blend1.alpha_to_one =
	ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToOne;

	blend[b].blend1.alpha_to_coverage_dither = (brw->intel.gen >= 7);
	}
	else {
	blend[b].blend1.alpha_to_coverage = false;
	blend[b].blend1.alpha_to_one = false;
	}
	}

	brw->state.dirty.cache \|= CACHE_NEW_BLEND_STATE;
	}

	const struct brw_tracked_state gen6_blend_state = {
	.dirty = {
	.mesa = (_NEW_COLOR \|
	_NEW_BUFFERS \|
	_NEW_MULTISAMPLE),
	.brw = BRW_NEW_BATCH,
	.cache = 0,
	},
	.emit = gen6_upload_blend_state,
	};

	static void
	gen6_upload_color_calc_state(struct brw_context *brw)
	{
	struct gl_context *ctx = &brw->intel.ctx;
	struct gen6_color_calc_state *cc;

	cc = brw_state_batch(brw, AUB_TRACE_CC_STATE,
	sizeof(*cc), 64, &brw->cc.state_offset);
	memset(cc, 0, sizeof(*cc));

	/* _NEW_COLOR */
	cc->cc0.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
	UNCLAMPED_FLOAT_TO_UBYTE(cc->cc1.alpha_ref_fi.ui, ctx->Color.AlphaRef);

	/* _NEW_STENCIL */
	cc->cc0.stencil_ref = ctx->Stencil.Ref[0];
	cc->cc0.bf_stencil_ref = ctx->Stencil.Ref[ctx->Stencil._BackFace];

	/* _NEW_COLOR */
	cc->constant_r = ctx->Color.BlendColorUnclamped[0];
	cc->constant_g = ctx->Color.BlendColorUnclamped[1];
	cc->constant_b = ctx->Color.BlendColorUnclamped[2];
	cc->constant_a = ctx->Color.BlendColorUnclamped[3];

	brw->state.dirty.cache \|= CACHE_NEW_COLOR_CALC_STATE;
	}

	const struct brw_tracked_state gen6_color_calc_state = {
	.dirty = {
	.mesa = _NEW_COLOR \| _NEW_STENCIL,
	.brw = BRW_NEW_BATCH,
	.cache = 0,
	},
	.emit = gen6_upload_color_calc_state,
	};

	static void upload_cc_state_pointers(struct brw_context *brw)
	{
	struct intel_context *intel = &brw->intel;

	BEGIN_BATCH(4);
	OUT_BATCH(_3DSTATE_CC_STATE_POINTERS << 16 \| (4 - 2));
	OUT_BATCH(brw->cc.blend_state_offset \| 1);
	OUT_BATCH(brw->cc.depth_stencil_state_offset \| 1);
	OUT_BATCH(brw->cc.state_offset \| 1);
	ADVANCE_BATCH();
	}

	const struct brw_tracked_state gen6_cc_state_pointers = {
	.dirty = {
	.mesa = 0,
	.brw = (BRW_NEW_BATCH \|
	BRW_NEW_STATE_BASE_ADDRESS),
	.cache = (CACHE_NEW_BLEND_STATE \|
	CACHE_NEW_COLOR_CALC_STATE \|
	CACHE_NEW_DEPTH_STENCIL_STATE)
	},
	.emit = upload_cc_state_pointers,
	};