alpha blending

1 files changed, 44 insertions, 1 deletions

diff --git a/video.hpp b/video.hpp
index 9a5dbe3..9b64543 100644
--- a/video.hpp
+++ b/video.hpp
@@ -83,13 +83,40 @@ enum class Depth_Mode {
 	never
 };
 
+enum class Blend_Factor {
+	zero,
+	one,
+	src_colour,
+	inv_src_colour,
+	dst_colour,
+	inv_dst_colour,
+	src_alpha,
+	inv_src_alpha,
+	dst_alpha,
+	inv_dst_alpha
+};
+
+enum class Blend_Mode {
+	add,
+	subtract,
+	reverse_subtract,
+	min,
+	max
+};
+
+
 struct Pipeline {
 	uint64_t pipeline_hash;
 	uint64_t descriptor_resource_hash;
 	int viewport[4];
 	int scissor[4];
 	bool depth_test, depth_write;
+	bool blend_enable;
 	Depth_Mode depth_mode;
+	Blend_Factor blend_src, blend_dst;
+	Blend_Mode blend_mode;
+	Blend_Factor blend_src_alpha, blend_dst_alpha;
+	Blend_Mode blend_mode_alpha;
 	Vertex_Format_Id vertex_format;
 	Shader_Id shader;
 	Descriptor descriptors[pipeline_max_descriptors];
@@ -109,7 +136,14 @@ struct Pipeline {
 			scissor[3] == other.scissor[3] &&
 			depth_test == other.depth_test &&
 			depth_write == other.depth_write &&
-			depth_mode == other.depth_mode;
+			depth_mode == other.depth_mode &&
+			blend_enable == other.blend_enable &&
+			blend_src == other.blend_src &&
+			blend_dst == other.blend_dst &&
+			blend_src_alpha == other.blend_src_alpha &&
+			blend_dst_alpha == other.blend_dst_alpha &&
+			blend_mode == other.blend_mode &&
+			blend_mode_alpha == other.blend_mode_alpha;
 	}
 
 	bool desc_layout_eq(const Pipeline& other) const {
@@ -257,6 +291,15 @@ struct Pipeline_Builder {
 	void viewport(float x, float y, float w, float h);
 	void scissor(float x, float y, float w, float h);
 	void depth(bool test, bool write, Depth_Mode mode);
+	void blend(Blend_Mode mode, Blend_Factor src, Blend_Factor dst);
+	void blend(
+		Blend_Mode mode_col,
+		Blend_Factor src_col,
+		Blend_Factor dst_col,
+		Blend_Mode mode_alpha,
+		Blend_Factor src_alpha,
+		Blend_Factor dst_alpha
+	);
 	void shader(Shader_Id s);
 	void vertex_format(Vertex_Format_Id vf);
 	void texture(int binding, Texture_Id t, Sampler_Id s);