freedreno/a3xx: add support for dual-source blending

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>

docs/relnotes/11.1.0.html

@@ -44,6 +44,7 @@ Note: some of the new features are only available with certain drivers.
 </p>
 
 <ul>
+<li>GL_ARB_blend_func_extended on freedreno (a3xx)</li>
 <li>GL_ARB_shader_texture_image_samples on i965, nv50, nvc0, r600</li>
 <li>GL_ARB_texture_query_lod on softpipe</li>
 <li>GL_ARB_gpu_shader_fp64 on r600 for Cypress/Cayman/Aruba chips</li>

src/gallium/drivers/freedreno/a3xx/fd3_blend.c

@@ -28,6 +28,7 @@
 
 #include "pipe/p_state.h"
 #include "util/u_blend.h"
+#include "util/u_dual_blend.h"
 #include "util/u_string.h"
 #include "util/u_memory.h"
 
@@ -131,5 +132,8 @@ fd3_blend_state_create(struct pipe_context *pctx,
 			so->rb_mrt[i].control |= A3XX_RB_MRT_CONTROL_DITHER_MODE(DITHER_ALWAYS);
 	}
 
+	if (cso->rt[0].blend_enable && util_blend_state_is_dual(cso, 0))
+		so->rb_render_control = A3XX_RB_RENDER_CONTROL_DUAL_COLOR_IN_ENABLE;
+
 	return so;
 }

src/gallium/drivers/freedreno/a3xx/fd3_blend.h

@@ -36,6 +36,7 @@
 
 struct fd3_blend_stateobj {
 	struct pipe_blend_state base;
+	uint32_t rb_render_control;
 	struct {
 		/* Blend control bits for color if there is an alpha channel */
 		uint32_t blend_control_rgb;

src/gallium/drivers/freedreno/a3xx/fd3_emit.c

@@ -443,8 +443,10 @@ fd3_emit_state(struct fd_context *ctx, struct fd_ringbuffer *ring,
 				A3XX_RB_MSAA_CONTROL_SAMPLE_MASK(ctx->sample_mask));
 	}
 
-	if ((dirty & (FD_DIRTY_ZSA | FD_DIRTY_PROG)) && !emit->key.binning_pass) {
-		uint32_t val = fd3_zsa_stateobj(ctx->zsa)->rb_render_control;
+	if ((dirty & (FD_DIRTY_ZSA | FD_DIRTY_PROG | FD_DIRTY_BLEND_DUAL)) &&
+		!emit->key.binning_pass) {
+		uint32_t val = fd3_zsa_stateobj(ctx->zsa)->rb_render_control |
+			fd3_blend_stateobj(ctx->blend)->rb_render_control;
 
 		val |= COND(fp->frag_face, A3XX_RB_RENDER_CONTROL_FACENESS);
 		val |= COND(fp->frag_coord, A3XX_RB_RENDER_CONTROL_XCOORD |
@@ -590,9 +592,13 @@ fd3_emit_state(struct fd_context *ctx, struct fd_ringbuffer *ring,
 		OUT_RING(ring, A3XX_GRAS_CL_VPORT_ZSCALE(ctx->viewport.scale[2]));
 	}
 
-	if (dirty & (FD_DIRTY_PROG | FD_DIRTY_FRAMEBUFFER)) {
+	if (dirty & (FD_DIRTY_PROG | FD_DIRTY_FRAMEBUFFER | FD_DIRTY_BLEND_DUAL)) {
 		struct pipe_framebuffer_state *pfb = &ctx->framebuffer;
-		fd3_program_emit(ring, emit, pfb->nr_cbufs, pfb->cbufs);
+		int nr_cbufs = pfb->nr_cbufs;
+		if (fd3_blend_stateobj(ctx->blend)->rb_render_control &
+			A3XX_RB_RENDER_CONTROL_DUAL_COLOR_IN_ENABLE)
+			nr_cbufs++;
+		fd3_program_emit(ring, emit, nr_cbufs, pfb->cbufs);
 	}
 
 	/* TODO we should not need this or fd_wfi() before emit_constants():

src/gallium/drivers/freedreno/freedreno_context.h

@@ -335,6 +335,7 @@ struct fd_context {
 		FD_DIRTY_SCISSOR     = (1 << 17),
 		FD_DIRTY_STREAMOUT   = (1 << 18),
 		FD_DIRTY_UCP         = (1 << 19),
+		FD_DIRTY_BLEND_DUAL  = (1 << 20),
 	} dirty;
 
 	struct pipe_blend_state *blend;

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -163,7 +163,6 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_MULTISAMPLE:
 	case PIPE_CAP_TEXTURE_BARRIER:
 	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
-	case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
 	case PIPE_CAP_START_INSTANCE:
 	case PIPE_CAP_COMPUTE:
 		return 0;
@@ -278,6 +277,8 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	/* Render targets. */
 	case PIPE_CAP_MAX_RENDER_TARGETS:
 		return screen->max_rts;
+	case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
+		return is_a3xx(screen) ? 1 : 0;
 
 	/* Queries. */
 	case PIPE_CAP_QUERY_TIME_ELAPSED:

src/gallium/drivers/freedreno/freedreno_state.c

@@ -27,6 +27,7 @@
  */
 
 #include "pipe/p_state.h"
+#include "util/u_dual_blend.h"
 #include "util/u_string.h"
 #include "util/u_memory.h"
 #include "util/u_helpers.h"
@@ -225,8 +226,17 @@ static void
 fd_blend_state_bind(struct pipe_context *pctx, void *hwcso)
 {
 	struct fd_context *ctx = fd_context(pctx);
+	struct pipe_blend_state *cso = hwcso;
+	bool old_is_dual = ctx->blend ?
+		ctx->blend->rt[0].blend_enable && util_blend_state_is_dual(ctx->blend, 0) :
+		false;
+	bool new_is_dual = cso ?
+		cso->rt[0].blend_enable && util_blend_state_is_dual(cso, 0) :
+		false;
 	ctx->blend = hwcso;
 	ctx->dirty |= FD_DIRTY_BLEND;
+	if (old_is_dual != new_is_dual)
+		ctx->dirty |= FD_DIRTY_BLEND_DUAL;
 }
 
 static void

src/gallium/drivers/freedreno/freedreno_util.c

@@ -104,10 +104,13 @@ fd_blend_factor(unsigned factor)
 	case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
 		return FACTOR_ONE_MINUS_CONSTANT_ALPHA;
 	case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
+		return FACTOR_ONE_MINUS_SRC1_COLOR;
 	case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
+		return FACTOR_ONE_MINUS_SRC1_ALPHA;
 	case PIPE_BLENDFACTOR_SRC1_COLOR:
+		return FACTOR_SRC1_COLOR;
 	case PIPE_BLENDFACTOR_SRC1_ALPHA:
-		/* I don't think these are supported */
+		return FACTOR_SRC1_ALPHA;
 	default:
 		DBG("invalid blend factor: %x", factor);
 		return 0;