From 5bc8f90c38981045515bab04d26687f929f62ec1 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sat, 21 Dec 2024 21:25:22 +1100
Subject: render a triangle

---
 video.hpp | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 77 insertions(+), 6 deletions(-)

(limited to 'video.hpp')

diff --git a/video.hpp b/video.hpp
index 6878d77..b59fd5c 100644
--- a/video.hpp
+++ b/video.hpp
@@ -1,17 +1,42 @@
 #ifndef video_hpp
 #define video_hpp
 
+#include <stddef.h>
 #include <stdint.h>
 
 struct App;
 struct Arena;
 struct Heap;
 
-typedef uint32_t Texture_Id;
-typedef uint32_t Buffer_Id;
+template <typename T>
+struct Primitive_Id {
+	T index;
+	Primitive_Id(): index(0) {}
+	Primitive_Id(T i): index(i) {}
+	bool operator==(Primitive_Id<T> other) const {
+		return index == other.index;
+	}
+	operator bool() const {
+		return index != 0;
+	}
+};
 
-struct Pipeline {
+struct Texture_Id : public Primitive_Id<uint32_t> {
+	using Primitive_Id<uint32_t>::Primitive_Id;
+};
+struct Buffer_Id  : public Primitive_Id<uint32_t> {
+	using Primitive_Id<uint32_t>::Primitive_Id;
+};
+struct Vertex_Format_Id : public Primitive_Id<uint32_t> {
+	using Primitive_Id<uint32_t>::Primitive_Id;
+};
+struct Shader_Id : public Primitive_Id<uint32_t> {
+	using Primitive_Id<uint32_t>::Primitive_Id;
+};
 
+struct Pipeline {
+	Vertex_Format_Id vertex_format;
+	Shader_Id shader;
 };
 
 struct Colour {
@@ -26,19 +51,30 @@ struct Render_Pass {
 		int size = sizeof *this, i;
 		uint8_t* bba = (uint8_t*)this;
 		uint8_t* bbb = (uint8_t*)&other;
-		for (i = 0; i < size; i++)
+		for (i = 0; i < size; i++, bba++, bbb++)
 			if (*bba != *bbb) return false;
 		return true;
 	}
 };
 
-struct Draw {
+struct Vertex_Buffer_Binding {
+	Buffer_Id id;
+	size_t offset;
+	int target;
+};
 
+struct Draw {
+	Vertex_Buffer_Binding* verts;
+	int vertex_count;
+	int instance_count;
+	int first_vertex;
+	int first_instance;
 };
 
 struct Pipeline_Builder {
 	Arena* arena;
 	Render_Pass* pass;
+	Pipeline* pip;
 
 	Pipeline_Builder(Arena* arena);
 
@@ -46,6 +82,12 @@ struct Pipeline_Builder {
 	void rp_target(Texture_Id id, Colour clear_colour);
 	Render_Pass& build_rp();
 	void validate_rp();
+
+	void begin();
+	void shader(Shader_Id s);
+	void vertex_format(Vertex_Format_Id vf);
+	Pipeline& build();
+	void validate();
 };
 
 struct Texture {
@@ -53,6 +95,21 @@ struct Texture {
 	bool alias;
 };
 
+namespace Buffer_Flags {
+	enum {
+		index_buffer   = 1 << 0,
+		vertex_buffer  = 1 << 1,
+		uniform_buffer = 1 << 2,
+		storage_buffer = 1 << 3,
+		cpu_read       = 1 << 4,
+		cpu_readwrite  = 1 << 5,
+		copy_src       = 1 << 6,
+		copy_dst       = 1 << 7
+	};
+};
+
+struct Buffer {};
+
 struct Context;
 struct Shader;
 struct Device {
@@ -76,7 +133,15 @@ struct Device {
 	Texture& get_texture(Texture_Id id);
 	void destroy_texture(Texture_Id id);
 
-	Shader* load_shader(const char* fname);
+	Buffer_Id create_buffer(size_t size, int flags);
+	void* map_buffer(Buffer_Id id, size_t offset, size_t size);
+	void unmap_buffer(Buffer_Id id);
+	Buffer& get_buffer(Buffer_Id id);
+	void destroy_buffer(Buffer_Id id);
+
+	Shader_Id load_shader(const char* fname);
+	Shader& get_shader(Shader_Id id);
+	void destroy_shader(Shader_Id id);
 };
 
 struct Context {
@@ -98,7 +163,13 @@ struct Context {
 };
 
 struct Shader {
+	Vertex_Format_Id vf;
 	void destroy(Device* dev);
+
+	/* -1 on failure */
+	int binding_index(const char* name);
+	int attribute_index(const char* name);
+	int target_index(const char* name);
 };
 
 #endif
-- 
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