From: Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
Date: Wed, 14 Jul 2021 20:06:37 +0000 (+0200)
Subject: implement clear operator with substract blending
X-Git-Tag: v0.2.0~65
X-Git-Url: https://git.osiis.dedyn.io/?a=commitdiff_plain;h=155dc1476f2dc67dd880555ebf9bc0d2bcb9b509;p=jp%2Fvkvg.git

implement clear operator with substract blending
---

diff --git a/src/vkvg_context_internal.c b/src/vkvg_context_internal.c
index f06245f..48daab0 100644
--- a/src/vkvg_context_internal.c
+++ b/src/vkvg_context_internal.c
@@ -491,7 +491,7 @@ void _bind_draw_pipeline (VkvgContext ctx) {
 	case VKVG_OPERATOR_OVER:
 		CmdBindPipeline(ctx->cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, ctx->pSurf->dev->pipe_OVER);
 		break;
-	case VKVG_OPERATOR_CLEAR:		
+	case VKVG_OPERATOR_CLEAR:
 		CmdBindPipeline(ctx->cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, ctx->pSurf->dev->pipe_CLEAR);
 		break;
 	case VKVG_OPERATOR_DIFFERENCE:
@@ -583,7 +583,6 @@ void _update_cur_pattern (VkvgContext ctx, VkvgPattern pat) {
 
 		//flush ctx in two steps to add the src transitioning in the cmd buff
 		if (ctx->cmdStarted){//transition of img without appropriate dependencies in subpass must be done outside renderpass.
-			//_flush_undrawn_vertices (ctx);//ensure all vertices are flushed
 			_end_render_pass (ctx);
 			_flush_vertices_caches (ctx);
 		}else {
diff --git a/src/vkvg_device_internal.c b/src/vkvg_device_internal.c
index fb199c9..f99b6a1 100644
--- a/src/vkvg_device_internal.c
+++ b/src/vkvg_device_internal.c
@@ -347,11 +347,12 @@ void _setupPipelines(VkvgDevice dev)
 	blendAttachmentState.alphaBlendOp = blendAttachmentState.colorBlendOp = VK_BLEND_OP_SUBTRACT;
 	VK_CHECK_RESULT(vkCreateGraphicsPipelines(dev->vkDev, dev->pipelineCache, 1, &pipelineCreateInfo, NULL, &dev->pipe_SUB));
 
-	//blendAttachmentState.blendEnable = VK_FALSE;
-	//rasterizationState.polygonMode = VK_POLYGON_MODE_POINT;
 	//shaderStages[1].pName = "op_CLEAR";
-	blendAttachmentState.srcAlphaBlendFactor = blendAttachmentState.dstAlphaBlendFactor =
-	blendAttachmentState.srcColorBlendFactor = blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO;
+	blendAttachmentState.colorBlendOp = blendAttachmentState.alphaBlendOp = VK_BLEND_OP_SUBTRACT;
+	blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+	blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
+	blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
+	blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
 	VK_CHECK_RESULT(vkCreateGraphicsPipelines(dev->vkDev, dev->pipelineCache, 1, &pipelineCreateInfo, NULL, &dev->pipe_CLEAR));