allow renderpasses to specify a clear mode and pipelines to specify their viewport and scissor

1 files changed, 31 insertions, 2 deletions

diff --git a/video.hpp b/video.hpp
index 7639b50..0363a9d 100644
--- a/video.hpp
+++ b/video.hpp
@@ -72,11 +72,27 @@ static_assert(sizeof(Constant_Buffer_Descriptor) <= descriptor_payload_size);
 struct Pipeline {
 	uint64_t pipeline_hash;
 	uint64_t descriptor_resource_hash;
+	int viewport[4];
+	int scissor[4];
 	Vertex_Format_Id vertex_format;
 	Shader_Id shader;
 	Descriptor descriptors[pipeline_max_descriptors];
 	int descriptor_count;
 
+	bool pipeline_eq(const Pipeline& other) const {
+		return
+			shader == other.shader &&
+			vertex_format == other.vertex_format &&
+			viewport[0] == other.viewport[0] &&
+			viewport[1] == other.viewport[1] &&
+			viewport[2] == other.viewport[2] &&
+			viewport[3] == other.viewport[3] &&
+			scissor[0] == other.scissor[0] &&
+			scissor[1] == other.scissor[1] &&
+			scissor[2] == other.scissor[2] &&
+			scissor[3] == other.scissor[3];
+	}
+
 	bool desc_layout_eq(const Pipeline& other) const {
 		int i, c = descriptor_count;
 		if (other.pipeline_hash != pipeline_hash)
@@ -122,6 +138,12 @@ struct Pipeline {
 	}
 };
 
+enum class Clear_Mode {
+	discard,
+	clear,
+	restore
+};
+
 struct Colour {
 	uint8_t r, g, b, a;
 };
@@ -129,6 +151,7 @@ struct Colour {
 struct Render_Pass {
 	Texture_Id target;
 	Colour clear;
+	Clear_Mode mode;
 
 	bool operator==(const Render_Pass& other) const {
 		int size = sizeof *this, i;
@@ -154,6 +177,7 @@ struct Draw {
 	int first_instance;
 };
 
+struct Device;
 struct Pipeline_Builder {
 	Arena* arena;
 	Render_Pass* pass;
@@ -163,10 +187,13 @@ struct Pipeline_Builder {
 
 	void begin_rp();
 	void rp_target(Texture_Id id, Colour clear_colour);
+	void rp_target(Texture_Id id, Clear_Mode mode);
 	Render_Pass& build_rp();
 	void validate_rp();
 
-	void begin();
+	void begin(Device* dev);
+	void viewport(float x, float y, float w, float h);
+	void scissor(float x, float y, float w, float h);
 	void shader(Shader_Id s);
 	void vertex_format(Vertex_Format_Id vf);
 	void texture(int binding, Texture_Id t, Sampler_Id s);
@@ -179,7 +206,9 @@ enum Resource_State {
 	undefined,
 	copy_dst,
 	copy_src,
-	shader_read
+	shader_read,
+	render_target,
+	presentable
 };
 
 struct Texture : public Asset {