diff options
author | Kenneth Graunke <kenneth@whitecape.org> | 2012-11-29 18:43:59 -0800 |
---|---|---|
committer | Kenneth Graunke <kenneth@whitecape.org> | 2014-01-31 17:50:06 -0800 |
commit | c96686a6cc0f53965b99a55046d1c55a867f93b3 (patch) | |
tree | 80c6e3742b0c4caf845a6a8411593a44a6eb7b56 /src/mesa/drivers/dri/i965/gen8_blend_state.c | |
parent | 17768bb7b428f367e351bf9bfa480bd0d4e57442 (diff) | |
download | external_mesa3d-c96686a6cc0f53965b99a55046d1c55a867f93b3.zip external_mesa3d-c96686a6cc0f53965b99a55046d1c55a867f93b3.tar.gz external_mesa3d-c96686a6cc0f53965b99a55046d1c55a867f93b3.tar.bz2 |
i965: Add the new 3DSTATE_PS_BLEND state packet.
v2: Only set GEN8_PS_BLEND_HAS_WRITEABLE_RT if color buffer writes are
enabled (caught by Eric Anholt).
v3: Set non-blending flags (writeable RT, alpha test, alpha to coverage)
for integer formats too. +14 Piglits.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net> [v2]
Diffstat (limited to 'src/mesa/drivers/dri/i965/gen8_blend_state.c')
-rw-r--r-- | src/mesa/drivers/dri/i965/gen8_blend_state.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/gen8_blend_state.c b/src/mesa/drivers/dri/i965/gen8_blend_state.c new file mode 100644 index 0000000..2efdfa7 --- /dev/null +++ b/src/mesa/drivers/dri/i965/gen8_blend_state.c @@ -0,0 +1,123 @@ +/* + * Copyright © 2012 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. + */ + +#include "brw_context.h" +#include "brw_state.h" +#include "brw_defines.h" +#include "brw_util.h" +#include "brw_wm.h" +#include "intel_batchbuffer.h" +#include "main/macros.h" +#include "main/enums.h" +#include "main/glformats.h" + +#define blend_factor(x) brw_translate_blend_factor(x) + +static void +gen8_upload_ps_blend(struct brw_context *brw) +{ + struct gl_context *ctx = &brw->ctx; + uint32_t dw1 = 0; + + /* _NEW_BUFFERS */ + struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; + + if (brw_color_buffer_write_enabled(brw)) + dw1 |= GEN8_PS_BLEND_HAS_WRITEABLE_RT; + + /* _NEW_COLOR */ + if (ctx->Color.AlphaEnabled) + dw1 |= GEN8_PS_BLEND_ALPHA_TEST_ENABLE; + + /* _NEW_MULTISAMPLE */ + if (ctx->Multisample._Enabled && ctx->Multisample.SampleAlphaToCoverage) + dw1 |= GEN8_PS_BLEND_ALPHA_TO_COVERAGE_ENABLE; + + /* 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." + * + * The 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." + */ + GLenum rb_type = + rb ? _mesa_get_format_datatype(rb->Format) : GL_UNSIGNED_NORMALIZED; + + if (rb && rb_type != GL_INT && rb_type != GL_UNSIGNED_INT && + (ctx->Color.BlendEnabled & 1)) { + GLenum eqRGB = ctx->Color.Blend[0].EquationRGB; + GLenum eqA = ctx->Color.Blend[0].EquationA; + GLenum srcRGB = ctx->Color.Blend[0].SrcRGB; + GLenum dstRGB = ctx->Color.Blend[0].DstRGB; + GLenum srcA = ctx->Color.Blend[0].SrcA; + GLenum dstA = ctx->Color.Blend[0].DstA; + + if (eqRGB == GL_MIN || eqRGB == GL_MAX) + srcRGB = dstRGB = GL_ONE; + + if (eqA == GL_MIN || eqA == GL_MAX) + srcA = dstA = GL_ONE; + + /* Due to hardware limitations, the destination may have information + * in an alpha channel even when the format specifies no alpha + * channel. In order to avoid getting any incorrect blending due to + * that alpha channel, coerce the blend factors to values that will + * not read the alpha channel, but will instead use the correct + * implicit value for alpha. + */ + if (!_mesa_base_format_has_channel(rb->_BaseFormat, GL_TEXTURE_ALPHA_TYPE)) { + srcRGB = brw_fix_xRGB_alpha(srcRGB); + srcA = brw_fix_xRGB_alpha(srcA); + dstRGB = brw_fix_xRGB_alpha(dstRGB); + dstA = brw_fix_xRGB_alpha(dstA); + } + + dw1 |= + GEN8_PS_BLEND_COLOR_BUFFER_BLEND_ENABLE | + SET_FIELD(blend_factor(dstRGB), GEN8_PS_BLEND_DST_BLEND_FACTOR) | + SET_FIELD(blend_factor(srcRGB), GEN8_PS_BLEND_SRC_BLEND_FACTOR) | + SET_FIELD(blend_factor(dstA), GEN8_PS_BLEND_DST_ALPHA_BLEND_FACTOR) | + SET_FIELD(blend_factor(srcA), GEN8_PS_BLEND_SRC_ALPHA_BLEND_FACTOR); + + if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB) + dw1 |= GEN8_PS_BLEND_INDEPENDENT_ALPHA_BLEND_ENABLE; + } + + BEGIN_BATCH(2); + OUT_BATCH(_3DSTATE_PS_BLEND << 16 | (2 - 2)); + OUT_BATCH(dw1); + ADVANCE_BATCH(); +} + +const struct brw_tracked_state gen8_ps_blend = { + .dirty = { + .mesa = _NEW_BUFFERS | _NEW_COLOR | _NEW_MULTISAMPLE, + .brw = BRW_NEW_CONTEXT, + .cache = 0, + }, + .emit = gen8_upload_ps_blend +}; |