indexed drawing and index buffers

rendering_api/metal/src/core/commands/command_buffer/metal_command_buffer.h

@@ -8,4 +8,5 @@ typedef struct gnPlatformCommandBuffer_t {
     id<MTLCommandBuffer> commandBuffer;
     id<MTLCommandEncoder> encoder;
     struct gnGraphicsPipeline_t* boundGraphcisPipeline;
+    gnBufferHandle indexBuffer;
 } gnPlatformCommandBuffer;

rendering_api/metal/src/core/commands/commands/metal_commands.m

@@ -70,10 +70,11 @@ void gnCommandSetScissorFn(struct gnCommandBuffer_t* buffer, struct gnScissor_t
     [encoder setScissorRect:scissorRect];
 }
 void gnCommandBindBufferFn(gnCommandBufferHandle buffer, gnBufferHandle bufferToBind, gnBufferType type) {
-    if (type == GN_VERTEX_BUFFER) {
+    id<MTLRenderCommandEncoder> encoder = (id<MTLRenderCommandEncoder>)buffer->commandBuffer->encoder;
-        id<MTLRenderCommandEncoder> encoder = (id<MTLRenderCommandEncoder>)buffer->commandBuffer->encoder;
+    if (type == GN_VERTEX_BUFFER)
         [encoder setVertexBuffer:bufferToBind->buffer->buffer offset:0 atIndex:0];
-    }
+    else if (type == GN_INDEX_BUFFER)
+        buffer->commandBuffer->indexBuffer = bufferToBind;
 }
 void gnCommandDrawFn(struct gnCommandBuffer_t* buffer, int vertexCount, int firstVertex, int instanceCount, int firstInstance) {
     if (buffer->commandBuffer->boundGraphcisPipeline != NULL) {

rendering_api/vulkan/src/buffers/vulkan_buffer.c

@@ -7,6 +7,7 @@
 VkBufferUsageFlags vkGryphnBufferType(gnBufferType type) {
 switch (type) {
 case GN_VERTEX_BUFFER: return VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
+case GN_INDEX_BUFFER: return VK_BUFFER_USAGE_INDEX_BUFFER_BIT;
 }
 }
 
@@ -90,6 +91,7 @@ void VkCopyBuffer(VkBuffer source, VkBuffer destination, size_t size, VkCommandP
 gnReturnCode gnCreateBufferFn(gnBufferHandle buffer, gnOutputDeviceHandle device, gnBufferInfo info) {
     buffer->buffer = malloc(sizeof(struct gnPlatformBuffer_t));
     VkBufferUsageFlags usage = vkGryphnBufferType(info.type);
+    buffer->buffer->useStagingBuffer = gnFalse;
     if (info.usage == GN_STATIC_DRAW) {
         gnReturnCode createdBuffer = VkCreateBuffer(
             &buffer->buffer->stagingBuffer, &buffer->buffer->stagingBufferMemory,

rendering_api/vulkan/src/commands/command_buffer/vulkan_command_buffer.h

@@ -1,7 +1,11 @@
 #pragma once
 #include "core/command/command_buffer/gryphn_command_buffer.h"
+#include "utils/gryphn_bool.h"
 #include <vulkan/vulkan.h>
 
 typedef struct gnPlatformCommandBuffer_t {
     VkCommandBuffer buffer;
+
+    gnBool changedBuffer;
+    gnBufferHandle boundIndexBuffer;
 } gnPlatformCommandBuffer;

rendering_api/vulkan/src/commands/commands/vulkan_commands.c

@@ -59,7 +59,16 @@ VkDeviceSize offsets[] = {0};
 void gnCommandBindBufferFn(gnCommandBufferHandle buffer, gnBufferHandle bufferToBind, gnBufferType type)  {
     if (type == GN_VERTEX_BUFFER)
         vkCmdBindVertexBuffers(buffer->commandBuffer->buffer, 0, 1, &bufferToBind->buffer->buffer, offsets);
+    else if (type == GN_INDEX_BUFFER) {
+        buffer->commandBuffer->changedBuffer = gnTrue;
+        buffer->commandBuffer->boundIndexBuffer = bufferToBind;
+    }
 }
 void gnCommandDrawFn(struct gnCommandBuffer_t* buffer, int vertexCount, int firstVertex, int instanceCount, int firstInstance) {
     vkCmdDraw(buffer->commandBuffer->buffer, vertexCount, instanceCount, firstVertex, firstInstance);
 }
+void gnCommandDrawIndexedFn(gnCommandBufferHandle buffer, gnIndexType type, int indexCount, int firstIndex, int vertexOffset, int instanceCount, int firstInstance)  {
+    if (buffer->commandBuffer->changedBuffer) vkCmdBindIndexBuffer(buffer->commandBuffer->buffer, buffer->commandBuffer->boundIndexBuffer->buffer->buffer, 0, (type == GN_UINT32) ? VK_INDEX_TYPE_UINT32 : VK_INDEX_TYPE_UINT16);
+    vkCmdDrawIndexed(buffer->commandBuffer->buffer, indexCount, instanceCount, firstIndex, vertexOffset, firstInstance);
+    buffer->commandBuffer->changedBuffer = gnFalse;
+}

src/core/buffers/gryphn_buffer.h

@@ -3,8 +3,13 @@
 #include "utils/gryphn_error_code.h"
 #include <core/gryphn_handles.h>
 
+typedef enum gnIndexType {
+    GN_UINT16, GN_UINT32
+} gnIndexType;
+
 typedef enum gnBufferType {
-    GN_VERTEX_BUFFER = 0x00000001
+    GN_VERTEX_BUFFER = 0x00000001f,
+    GN_INDEX_BUFFER  = 0x00000002f,
 } gnBufferType;
 
 typedef enum gnBufferUsage {

src/core/command/commands/gryphn_command.c

@@ -23,3 +23,6 @@ void gnCommandBindBuffer(gnCommandBufferHandle buffer, gnBufferHandle bufferToBi
 void gnCommandDraw(struct gnCommandBuffer_t* buffer, int vertexCount, int firstVertex, int instanceCount, int firstInstance) {
     buffer->commandPool->commandFunctions->_gnCommandDraw(buffer, vertexCount, firstVertex, instanceCount, firstInstance);
 }
+void gnCommandDrawIndexed(gnCommandBufferHandle buffer, gnIndexType type, int indexCount, int firstIndex, int vertexOffset, int instanceCount, int firstInstance) {
+    buffer->commandPool->commandFunctions->_gnCommandDrawIndexed(buffer, type, indexCount, firstIndex, vertexOffset, instanceCount, firstInstance);
+}

src/core/command/commands/gryphn_command.h

@@ -13,3 +13,4 @@ void gnCommandSetScissor(gnCommandBufferHandle buffer, gnScissor scissor);
 void gnCommandBindBuffer(gnCommandBufferHandle buffer, gnBufferHandle bufferToBind, gnBufferType type);
 
 void gnCommandDraw(gnCommandBufferHandle buffer, int vertexCount, int firstVertex, int instanceCount, int firstInstance);
+void gnCommandDrawIndexed(gnCommandBufferHandle buffer, gnIndexType type, int indexCount, int firstIndex, int vertexOffset, int instanceCount, int firstInstance);

src/core/gryphn_platform_functions.h

@@ -113,4 +113,5 @@ typedef struct gnCommandFunctions_t {
 
     void (*_gnCommandBindBuffer)(gnCommandBufferHandle buffer, gnBufferHandle bufferToBind, gnBufferType type);
     void (*_gnCommandDraw)(gnCommandBufferHandle buffer, int vertexCount, int firstVertex, int instanceCount, int firstInstance);
+    void (*_gnCommandDrawIndexed)(gnCommandBufferHandle buffer, gnIndexType type, int indexCount, int firstIndex, int vertexOffset, int instanceCount, int firstInstance);
 } gnCommandFunctions;

src/core/instance/init/gryphn_init.c

@@ -109,4 +109,5 @@ void gnLoadCommandFunctions(struct gnDynamicLibrary_t* lib, struct gnCommandFunc
     gnLoadDLLFunction(lib, functions->_gnCommandSetScissor, "gnCommandSetScissorFn");
     gnLoadDLLFunction(lib, functions->_gnCommandBindBuffer, "gnCommandBindBufferFn");
     gnLoadDLLFunction(lib, functions->_gnCommandDraw, "gnCommandDrawFn");
+    gnLoadDLLFunction(lib, functions->_gnCommandDrawIndexed, "gnCommandDrawIndexedFn");
 }