# define GEN8_RASTER_SCISSOR_ENABLE (1 << 1)
# define GEN8_RASTER_VIEWPORT_Z_CLIP_TEST_ENABLE (1 << 0)
+/* Gen8 BLEND_STATE */
+/* DW0 */
+#define GEN8_BLEND_ALPHA_TO_COVERAGE_ENABLE (1 << 31)
+#define GEN8_BLEND_INDEPENDENT_ALPHA_BLEND_ENABLE (1 << 30)
+#define GEN8_BLEND_ALPHA_TO_ONE_ENABLE (1 << 29)
+#define GEN8_BLEND_ALPHA_TO_COVERAGE_DITHER_ENABLE (1 << 28)
+#define GEN8_BLEND_ALPHA_TEST_ENABLE (1 << 27)
+#define GEN8_BLEND_ALPHA_TEST_FUNCTION_MASK INTEL_MASK(26, 24)
+#define GEN8_BLEND_ALPHA_TEST_FUNCTION_SHIFT 24
+#define GEN8_BLEND_COLOR_DITHER_ENABLE (1 << 23)
+#define GEN8_BLEND_X_DITHER_OFFSET_MASK INTEL_MASK(22, 21)
+#define GEN8_BLEND_X_DITHER_OFFSET_SHIFT 21
+#define GEN8_BLEND_Y_DITHER_OFFSET_MASK INTEL_MASK(20, 19)
+#define GEN8_BLEND_Y_DITHER_OFFSET_SHIFT 19
+/* DW1 + 2n */
+#define GEN8_BLEND_COLOR_BUFFER_BLEND_ENABLE (1 << 31)
+#define GEN8_BLEND_SRC_BLEND_FACTOR_MASK INTEL_MASK(30, 26)
+#define GEN8_BLEND_SRC_BLEND_FACTOR_SHIFT 26
+#define GEN8_BLEND_DST_BLEND_FACTOR_MASK INTEL_MASK(25, 21)
+#define GEN8_BLEND_DST_BLEND_FACTOR_SHIFT 21
+#define GEN8_BLEND_COLOR_BLEND_FUNCTION_MASK INTEL_MASK(20, 18)
+#define GEN8_BLEND_COLOR_BLEND_FUNCTION_SHIFT 18
+#define GEN8_BLEND_SRC_ALPHA_BLEND_FACTOR_MASK INTEL_MASK(17, 13)
+#define GEN8_BLEND_SRC_ALPHA_BLEND_FACTOR_SHIFT 13
+#define GEN8_BLEND_DST_ALPHA_BLEND_FACTOR_MASK INTEL_MASK(12, 8)
+#define GEN8_BLEND_DST_ALPHA_BLEND_FACTOR_SHIFT 8
+#define GEN8_BLEND_ALPHA_BLEND_FUNCTION_MASK INTEL_MASK(7, 5)
+#define GEN8_BLEND_ALPHA_BLEND_FUNCTION_SHIFT 5
+#define GEN8_BLEND_WRITE_DISABLE_ALPHA (1 << 3)
+#define GEN8_BLEND_WRITE_DISABLE_RED (1 << 2)
+#define GEN8_BLEND_WRITE_DISABLE_GREEN (1 << 1)
+#define GEN8_BLEND_WRITE_DISABLE_BLUE (1 << 0)
+/* DW1 + 2n + 1 */
+#define GEN8_BLEND_LOGIC_OP_ENABLE (1 << 31)
+#define GEN8_BLEND_LOGIC_OP_FUNCTION_MASK INTEL_MASK(30, 27)
+#define GEN8_BLEND_LOGIC_OP_FUNCTION_SHIFT 27
+#define GEN8_BLEND_PRE_BLEND_SRC_ONLY_CLAMP_ENABLE (1 << 4)
+#define GEN8_BLEND_COLOR_CLAMP_RANGE_RTFORMAT (2 << 2)
+#define GEN8_BLEND_PRE_BLEND_COLOR_CLAMP_ENABLE (1 << 1)
+#define GEN8_BLEND_POST_BLEND_COLOR_CLAMP_ENABLE (1 << 0)
+
#define _3DSTATE_PS_BLEND 0x784D /* GEN8+ */
/* DW1 */
# define GEN8_PS_BLEND_ALPHA_TO_COVERAGE_ENABLE (1 << 31)
#include "main/glformats.h"
#define blend_factor(x) brw_translate_blend_factor(x)
+#define blend_eqn(x) brw_translate_blend_equation(x)
+
+static void
+gen8_upload_blend_state(struct brw_context *brw)
+{
+ struct gl_context *ctx = &brw->ctx;
+
+ /* 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.
+ */
+ int nr_draw_buffers = ctx->DrawBuffer->_NumColorDrawBuffers;
+ if (nr_draw_buffers == 0 && ctx->Color.AlphaEnabled)
+ nr_draw_buffers = 1;
+
+ int size = 4 + 8 * nr_draw_buffers;
+ uint32_t *blend = brw_state_batch(brw, AUB_TRACE_BLEND_STATE,
+ size, 64, &brw->cc.blend_state_offset);
+ memset(blend, 0, size);
+
+ /* 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."
+ */
+ struct gl_renderbuffer *rb0 = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ GLenum rb_zero_type =
+ rb0 ? _mesa_get_format_datatype(rb0->Format) : GL_UNSIGNED_NORMALIZED;
+
+ if (rb_zero_type != GL_INT && rb_zero_type != GL_UNSIGNED_INT) {
+ /* _NEW_MULTISAMPLE */
+ if (ctx->Multisample._Enabled) {
+ if (ctx->Multisample.SampleAlphaToCoverage) {
+ blend[0] |= GEN8_BLEND_ALPHA_TO_COVERAGE_ENABLE;
+ blend[0] |= GEN8_BLEND_ALPHA_TO_COVERAGE_DITHER_ENABLE;
+ }
+ if (ctx->Multisample.SampleAlphaToOne)
+ blend[0] |= GEN8_BLEND_ALPHA_TO_ONE_ENABLE;
+ }
+
+ /* _NEW_COLOR */
+ if (ctx->Color.AlphaEnabled) {
+ blend[0] |=
+ GEN8_BLEND_ALPHA_TEST_ENABLE |
+ SET_FIELD(intel_translate_compare_func(ctx->Color.AlphaFunc),
+ GEN8_BLEND_ALPHA_TEST_FUNCTION);
+ }
+
+ if (ctx->Color.DitherFlag) {
+ blend[0] |= GEN8_BLEND_COLOR_DITHER_ENABLE;
+ }
+ }
+
+ for (int i = 0; i < nr_draw_buffers; i++) {
+ /* _NEW_BUFFERS */
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
+ GLenum rb_type =
+ rb ? _mesa_get_format_datatype(rb->Format) : 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."
+ */
+ bool integer = rb_type == GL_INT || rb_type == GL_UNSIGNED_INT;
+
+ /* _NEW_COLOR */
+ if (ctx->Color.ColorLogicOpEnabled) {
+ blend[1 + 2*i+1] |=
+ GEN8_BLEND_LOGIC_OP_ENABLE |
+ SET_FIELD(intel_translate_logic_op(ctx->Color.LogicOp),
+ GEN8_BLEND_LOGIC_OP_FUNCTION);
+ } else if (ctx->Color.BlendEnabled & (1 << i) && !integer) {
+ GLenum eqRGB = ctx->Color.Blend[i].EquationRGB;
+ GLenum eqA = ctx->Color.Blend[i].EquationA;
+ GLenum srcRGB = ctx->Color.Blend[i].SrcRGB;
+ GLenum dstRGB = ctx->Color.Blend[i].DstRGB;
+ GLenum srcA = ctx->Color.Blend[i].SrcA;
+ GLenum dstA = ctx->Color.Blend[i].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 (rb && !_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);
+ }
+
+ blend[1 + 2*i] |=
+ GEN8_BLEND_COLOR_BUFFER_BLEND_ENABLE |
+ SET_FIELD(blend_factor(dstRGB), GEN8_BLEND_DST_BLEND_FACTOR) |
+ SET_FIELD(blend_factor(srcRGB), GEN8_BLEND_SRC_BLEND_FACTOR) |
+ SET_FIELD(blend_factor(dstA), GEN8_BLEND_DST_ALPHA_BLEND_FACTOR) |
+ SET_FIELD(blend_factor(srcA), GEN8_BLEND_SRC_ALPHA_BLEND_FACTOR) |
+ SET_FIELD(blend_eqn(eqRGB), GEN8_BLEND_COLOR_BLEND_FUNCTION) |
+ SET_FIELD(blend_eqn(eqA), GEN8_BLEND_ALPHA_BLEND_FUNCTION);
+
+ if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB)
+ blend[0] |= GEN8_BLEND_INDEPENDENT_ALPHA_BLEND_ENABLE;
+ }
+
+ /* 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[1 + 2*i+1] |=
+ GEN8_BLEND_PRE_BLEND_COLOR_CLAMP_ENABLE |
+ GEN8_BLEND_POST_BLEND_COLOR_CLAMP_ENABLE |
+ GEN8_BLEND_COLOR_CLAMP_RANGE_RTFORMAT;
+
+ if (!ctx->Color.ColorMask[i][0])
+ blend[1 + 2*i] |= GEN8_BLEND_WRITE_DISABLE_RED;
+ if (!ctx->Color.ColorMask[i][1])
+ blend[1 + 2*i] |= GEN8_BLEND_WRITE_DISABLE_GREEN;
+ if (!ctx->Color.ColorMask[i][2])
+ blend[1 + 2*i] |= GEN8_BLEND_WRITE_DISABLE_BLUE;
+ if (!ctx->Color.ColorMask[i][3])
+ blend[1 + 2*i] |= GEN8_BLEND_WRITE_DISABLE_ALPHA;
+
+ /* From the BLEND_STATE docs, DWord 0, Bit 29 (AlphaToOne Enable):
+ * "If Dual Source Blending is enabled, this bit must be disabled."
+ */
+ WARN_ONCE(ctx->Color.Blend[i]._UsesDualSrc &&
+ ctx->Multisample._Enabled &&
+ ctx->Multisample.SampleAlphaToOne,
+ "HW workaround: disabling alpha to one with dual src "
+ "blending\n");
+ if (ctx->Color.Blend[i]._UsesDualSrc)
+ blend[0] &= ~GEN8_BLEND_ALPHA_TO_ONE_ENABLE;
+ }
+
+ BEGIN_BATCH(2);
+ OUT_BATCH(_3DSTATE_BLEND_STATE_POINTERS << 16 | (2 - 2));
+ OUT_BATCH(brw->cc.blend_state_offset | 1);
+ ADVANCE_BATCH();
+}
+
+const struct brw_tracked_state gen8_blend_state = {
+ .dirty = {
+ .mesa = _NEW_COLOR | _NEW_BUFFERS | _NEW_MULTISAMPLE,
+ .brw = BRW_NEW_BATCH | BRW_NEW_STATE_BASE_ADDRESS,
+ .cache = 0,
+ },
+ .emit = gen8_upload_blend_state,
+};
static void
gen8_upload_ps_blend(struct brw_context *brw)
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