Added rect draw api

Added some new maths types
Updated shaders to use new D_Rect structure
Added rect buffers to frames
Misc cleanup

code/vulkan/core.c

@@ -372,6 +372,16 @@ bool Vk_Setup(SDL_Window *window) {
 
 		vk.CreateDescriptorPool(vk.device, &descriptor_pool, 0, &frame->descriptors);
 
+		// rect buffer
+		//
+
+		Vk_Buffer *rbo = &frame->rbo;
+		rbo->usage        = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
+		rbo->size         = D_MAX_RECTS * sizeof(D_Rect);
+		rbo->host_visible = true;
+
+		Vk_BufferCreate(rbo);
+
 		VkSemaphoreCreateInfo semaphore = { 0 };
 		semaphore.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
 
@@ -547,7 +557,7 @@ internal VkDeviceMemory Vk_Allocate(VkMemoryRequirements *mreq, VkMemoryProperty
 		}
 	}
 
-	if (type_index != -1) {
+	if (type_index != U32_MAX) {
 		VkMemoryAllocateInfo alloc_info = { 0 };
 		alloc_info.sType           = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
 		alloc_info.allocationSize  = mreq->size;
@@ -556,6 +566,7 @@ internal VkDeviceMemory Vk_Allocate(VkMemoryRequirements *mreq, VkMemoryProperty
 		vk.AllocateMemory(vk.device, &alloc_info, 0, &result);
 	}
 
+	Assert(result != VK_NULL_HANDLE);
 	return result;
 }
 
@@ -566,6 +577,7 @@ void Vk_BufferCreate(Vk_Buffer *buffer) {
 	create_info.size  = buffer->size;
 
 	vk.CreateBuffer(vk.device, &create_info, 0, &buffer->handle);
+	Assert(buffer->handle != VK_NULL_HANDLE);
 
 	VkMemoryRequirements req;
 	vk.GetBufferMemoryRequirements(vk.device, buffer->handle, &req);
@@ -580,6 +592,7 @@ void Vk_BufferCreate(Vk_Buffer *buffer) {
 	if (buffer->host_visible) {
 		vk.MapMemory(vk.device, buffer->memory, 0, buffer->size, 0, &buffer->data);
 	}
+
 }
 
 void Vk_ImageCreate(Vk_Image *image) {

code/vulkan/core.h

@@ -96,6 +96,8 @@ struct Vk_Frame {
 	U32 next_scratch;
 	Vk_CommandBuffer scratch[VK_NUM_SCRATCH];
 
+	Vk_Buffer rbo;
+
 	U32 image; // swapchain image index
 };
 

code/vulkan/functions.h

@@ -62,6 +62,8 @@
 	VK_FUNC(CmdDraw);
 	VK_FUNC(CmdSetViewport);
 	VK_FUNC(CmdSetScissor);
+	VK_FUNC(CmdDrawIndexed);
+	VK_FUNC(CmdBindIndexBuffer);
 
 	VK_FUNC(CmdPushConstants);
 	VK_FUNC(CmdCopyBufferToImage);

code/vulkan/shaders/basic.frag

@@ -4,12 +4,12 @@
 
 layout(location = 0) in vec2 frag_uv;
 layout(location = 1) in vec4 frag_c;
-layout(location = 2) in flat uint idx;
+layout(location = 2) in flat uint texid;
 
 layout(location = 0) out vec4 framebuffer;
 
-layout(binding = 1) uniform sampler2D u_image[];
+layout(binding = 1) uniform sampler2D u_images[];
 
 void main() {
-	framebuffer = frag_c * texture(u_image[idx], frag_uv);
+	framebuffer = frag_c * texture(u_images[texid], frag_uv);
 }

code/vulkan/shaders/basic.vert

@@ -2,6 +2,28 @@
 
 #extension GL_EXT_scalar_block_layout : enable
 
+uint indices[6] = { 0, 1, 3, 0, 3, 2 };
+
+vec2 verticies[4] = vec2[](
+		vec2(-0.5, -0.5),
+		vec2( 0.5, -0.5),
+		vec2(-0.5,  0.5),
+		vec2( 0.5,  0.5)
+);
+
+struct G_Rect {
+	uint id;
+
+	uint   c[4];
+	float uv[4];
+
+	float angle;
+	float x, y;
+	float w, h;
+
+	float _pad0, _pad1;
+};
+
 struct Vertex {
 	vec4 p;
 	vec2 uv;
@@ -15,22 +37,28 @@ uniform Global {
 };
 
 layout(binding = 0, scalar)
-readonly buffer Vertices {
-	Vertex vtx[];
+readonly buffer Rect {
+	G_Rect rects[];
 };
 
 layout(location = 0) out vec2 frag_uv;
 layout(location = 1) out vec4 frag_c;
-layout(location = 2) out flat uint idx;
+layout(location = 2) out flat uint texid;
+
+vec4 unorm_colour(uint c) {
+	vec4 result = vec4((c >> 0) & 0xFF, (c >> 8) & 0xFF, (c >> 16) & 0xFF, (c >> 24) & 0xFF) / 255.0f;
+	return result;
+}
 
 void main() {
-	Vertex v = vtx[gl_VertexIndex];
+	G_Rect rect = rects[gl_InstanceIndex];
+	uint   idx  = indices[gl_VertexIndex];
 
-	gl_Position = proj * v.p;
+	vec2 p = (verticies[idx] * vec2(rect.w, rect.h)) + vec2(rect.x, rect.y);
 
-	frag_uv = v.uv;
-	frag_c  = vec4((v.c >> 24) & 0xFF, (v.c >> 16) & 0xFF, (v.c >> 8) & 0xFF, (v.c >> 0) & 0xFF) / 255.0f;
-	frag_c  = frag_c.abgr;
+	gl_Position = proj * vec4(p, 1.0f, 1.0f);
 
-	idx = v.pad;
+	frag_uv = vec2(rect.uv[(idx & 1) << 1], rect.uv[1 + (uint(idx / 2) << 1)]);
+	frag_c  = unorm_colour(rect.c[idx]);
+	texid   = rect.id;
 }