refactor to have graphics and windowing seperategfx-rewrite

3 files changed, 811 insertions, 0 deletions

diff --git a/src/gfx/irodeo_gfx.h b/src/gfx/irodeo_gfx.h
new file mode 100644
index 0000000..3acc49f
--- /dev/null
+++ b/src/gfx/irodeo_gfx.h
@@ -0,0 +1,30 @@
+
+// -- internal --
+// public
+#include "rodeo/common.h"
+// private
+#include "gfx/irodeo_gfx_t.h"
+
+// -- external --
+#include "bgfx/c99/bgfx.h"
+#include "stc/cstr.h"
+
+bgfx_shader_handle_t
+irodeo_gfx_shader_load(const cstr path);
+
+void
+irodeo_gfx_render_buffer_transient_alloc(void);
+
+void
+irodeo_gfx_frame_stall(void);
+
+#define											\
+mrodeo_bgfx_vertex_layout_do(vertex_layout)		\
+	mrodeo_defer_do(							\
+		bgfx_vertex_layout_begin(				\
+			vertex_layout,						\
+			bgfx_get_renderer_type()			\
+		),										\
+		bgfx_vertex_layout_end(vertex_layout)	\
+	)
+
diff --git a/src/gfx/irodeo_gfx_t.h b/src/gfx/irodeo_gfx_t.h
new file mode 100644
index 0000000..7d9d1b7
--- /dev/null
+++ b/src/gfx/irodeo_gfx_t.h
@@ -0,0 +1,49 @@
+#pragma once
+
+// -- internal --
+// public
+#include "rodeo/gfx_t.h"
+
+// -- external --
+#include "bgfx/c99/bgfx.h"
+#define CGLM_FORCE_DEPTH_ZERO_TO_ONE
+#include "cglm/mat4.h"
+
+typedef uint16_t irodeo_index_type_t;
+
+typedef
+struct
+{
+	bgfx_vertex_layout_t vertex_layout;
+	//bgfx_dynamic_vertex_buffer_handle_t vertex_buffer_handle;
+	//bgfx_dynamic_index_buffer_handle_t index_buffer_handle;
+	bgfx_transient_vertex_buffer_t vertex_buffer_handle;
+	bgfx_transient_index_buffer_t index_buffer_handle;
+	rodeo_gfx_vertex_t *batched_vertices;
+	irodeo_index_type_t *batched_indices;
+	irodeo_index_type_t vertex_size;
+	irodeo_index_type_t index_count;
+	irodeo_index_type_t index_size;
+	//irodeo_index_type_t batched_indices[(mrodeo_vertex_size_max / 4) * 6];
+	rodeo_gfx_texture_2d_t default_texture;
+	bgfx_texture_handle_t *active_texture_p;
+	bgfx_shader_handle_t vertex_shader;
+	bgfx_shader_handle_t fragment_shader;
+	bgfx_program_handle_t program_shader;
+	bgfx_uniform_handle_t texture_uniforms[2];
+	mat4 view_matrix;
+	mat4 proj_matrix;
+	uint64_t frame_count;
+	uint32_t frame_limit;
+	uint32_t frame_start;
+	uint32_t frame_end;
+	float frame_time;
+}
+irodeo_gfx_state_t;
+
+struct
+irodeo_gfx_texture_internal
+{
+	bgfx_texture_handle_t texture_bgfx;
+};
+
diff --git a/src/gfx/rodeo_gfx.c b/src/gfx/rodeo_gfx.c
new file mode 100644
index 0000000..38dc145
--- /dev/null
+++ b/src/gfx/rodeo_gfx.c
@@ -0,0 +1,732 @@
+
+// -- internal --
+// public
+#include "rodeo.h" // TODO remove this
+#include "rodeo/gfx.h"
+#include "rodeo/window.h"
+#include "rodeo/log.h"
+// private
+#include "gfx/irodeo_gfx.h"
+#include "window/irodeo_window.h"
+#include "rodeo_config.h"
+
+// -- external --
+#include "bgfx/c99/bgfx.h"
+#define CGLM_FORCE_DEPTH_ZERO_TO_ONE
+#include "cglm/cglm.h"
+#include "SDL_image.h"
+#include "SDL.h" // used for timing, need to replace in this file with BGFX at some point
+
+static irodeo_gfx_state_t irodeo_gfx_state = {0};
+
+void
+rodeo_gfx_init(void)
+{
+
+#ifdef __EMSCRIPTEN__
+	bgfx_render_frame(-1);
+#endif
+
+	bgfx_platform_data_t pd = {0};
+	memset(&pd, 0, sizeof(bgfx_platform_data_t));
+
+#if !__EMSCRIPTEN__
+	// x11
+	pd.ndt = irodeo_window_wmi_get().info.x11.display;
+	pd.nwh = (void*)(uintptr_t)irodeo_window_wmi_get().info.x11.window;
+#else
+	// web
+	pd.nwh = (void*)"#canvas";
+#endif
+
+	bgfx_init_t init = {0};
+	bgfx_init_ctor(&init);
+	//init.type = BGFX_RENDERER_TYPE_COUNT; // auto determine renderer
+	init.type = BGFX_RENDERER_TYPE_OPENGL; // force opengl renderer
+	//SDL_GetWindowSize(irodeo_gfx_state.window, &irodeo_gfx_state.screen_width, &irodeo_gfx_state.screen_height);
+	init.resolution.width = rodeo_window_screen_height_get();
+	init.resolution.height = rodeo_window_screen_width_get();
+	init.resolution.reset = BGFX_RESET_VSYNC;
+	init.platformData = pd;
+	bgfx_init(&init);
+
+	bgfx_set_debug(BGFX_DEBUG_TEXT);
+
+	//bgfx_set_state(BGFX_STATE_CULL_CCW, 0);
+	
+	//bgfx_dbg_text_clear(0x65, false);
+
+	bgfx_set_view_clear(
+		0,
+		BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH,
+		0x443355FF,
+		1.0f,
+		0
+	);
+	bgfx_set_view_rect(0, 0, 0, rodeo_window_screen_width_get(), rodeo_window_screen_height_get());
+
+	rodeo_log(rodeo_logLevel_info, "Setting up default render pipeline...");
+	// set up vertex layout
+	mrodeo_bgfx_vertex_layout_do(&irodeo_gfx_state.vertex_layout)
+	{
+		bgfx_vertex_layout_add(&irodeo_gfx_state.vertex_layout, BGFX_ATTRIB_POSITION, 3, BGFX_ATTRIB_TYPE_FLOAT, false, false);
+		bgfx_vertex_layout_add(&irodeo_gfx_state.vertex_layout, BGFX_ATTRIB_COLOR0, 4, BGFX_ATTRIB_TYPE_FLOAT, false, false);
+		bgfx_vertex_layout_add(&irodeo_gfx_state.vertex_layout, BGFX_ATTRIB_TEXCOORD0, 2, BGFX_ATTRIB_TYPE_FLOAT, false, false);
+		bgfx_vertex_layout_add(&irodeo_gfx_state.vertex_layout, BGFX_ATTRIB_TEXCOORD1, 1, BGFX_ATTRIB_TYPE_FLOAT, false, false);
+	}
+
+	// load shaders
+	cstr shader_path = cstr_lit("???");
+	switch(bgfx_get_renderer_type()) {
+        case BGFX_RENDERER_TYPE_NOOP:
+			rodeo_log(
+				rodeo_logLevel_error,
+				"BGFX failed to get determine an appropriate renderer"
+			);
+			exit(EXIT_FAILURE);
+        case BGFX_RENDERER_TYPE_OPENGLES:
+			cstr_assign(
+				&shader_path,
+				"shaders/100_es/"
+			);
+			break;
+        case BGFX_RENDERER_TYPE_VULKAN:
+			cstr_assign(
+				&shader_path,
+				"shaders/spirv/"
+			);
+			break;
+        case BGFX_RENDERER_TYPE_OPENGL:
+			cstr_assign(
+				&shader_path,
+				"shaders/opengl/"
+			);
+			break;
+		default:
+			rodeo_log(
+				rodeo_logLevel_error,
+				"No shaders implemented for BGFX renderer chosen"
+			);
+			exit(EXIT_FAILURE);
+    }
+	cstr vertex_shader_path = cstr_lit("simple.vertex.bin");
+	cstr fragment_shader_path = cstr_lit("simple.fragment.bin");
+
+	cstr_insert_s(
+		&vertex_shader_path,
+		0,
+		shader_path
+	);
+	cstr_insert_s(
+		&fragment_shader_path,
+		0,
+		shader_path
+	);
+
+	irodeo_gfx_state.vertex_shader = irodeo_gfx_shader_load(vertex_shader_path);
+	irodeo_gfx_state.fragment_shader = irodeo_gfx_shader_load(fragment_shader_path);
+	irodeo_gfx_state.program_shader = bgfx_create_program(
+		irodeo_gfx_state.vertex_shader,
+		irodeo_gfx_state.fragment_shader,
+		true
+	);
+	rodeo_log(
+		rodeo_logLevel_info,
+		"Default render pipeline finished setup"
+	);
+
+	//bgfx_texture_handle_t default_bgfx_texture = rodeo_texture_2d_create_default();
+
+	irodeo_gfx_state.default_texture.internal_texture = malloc(sizeof(irodeo_gfx_texture_internal_t));
+
+	// used for binding textures to shader uniforms
+	irodeo_gfx_state.texture_uniforms[0] = bgfx_create_uniform("default_texture", BGFX_UNIFORM_TYPE_SAMPLER, 1);
+	irodeo_gfx_state.texture_uniforms[1] = bgfx_create_uniform("texture_0", BGFX_UNIFORM_TYPE_SAMPLER, 1);
+
+	{
+		// represents 1 pixel sized white texture
+		const uint8_t default_texture_data[] = {
+			//red, blue, green, alpha
+			0xff, 0xff, 0xff, 0xff,
+		};
+
+		irodeo_gfx_state.default_texture.internal_texture->texture_bgfx = 
+			bgfx_create_texture_2d(
+				1,
+				1,
+				false,
+				0,
+				BGFX_TEXTURE_FORMAT_RGBA8,
+				BGFX_SAMPLER_UVW_CLAMP | BGFX_SAMPLER_MAG_POINT,
+				bgfx_copy(
+					&default_texture_data,
+					sizeof(default_texture_data)
+				)
+			);
+		irodeo_gfx_state.default_texture.width = 1;
+		irodeo_gfx_state.default_texture.height = 1;
+
+		irodeo_gfx_state.active_texture_p = &irodeo_gfx_state.default_texture.internal_texture->texture_bgfx;
+	}
+
+	SDL_SetWindowResizable(irodeo_window_get(), true);
+
+	bgfx_reset(
+		(uint32_t)rodeo_window_screen_width_get(),
+		(uint32_t)rodeo_window_screen_height_get(),
+		//BGFX_RESET_MSAA_X16 | BGFX_RESET_MAXANISOTROPY,
+		BGFX_RESET_VSYNC,
+		BGFX_TEXTURE_FORMAT_COUNT
+	);
+
+	rodeo_random_seed_set(SDL_GetTicks64());
+
+	irodeo_gfx_state.frame_end = (uint32_t)SDL_GetPerformanceCounter();
+}
+
+void
+rodeo_gfx_deinit(void)
+{
+
+	free(irodeo_gfx_state.default_texture.internal_texture);
+
+	bgfx_destroy_program(irodeo_gfx_state.program_shader);
+	bgfx_shutdown();
+}
+
+void
+rodeo_gfx_frame_begin(void)
+{
+	//vec3 eye = {0.0f, 0.0f, -35.0f};
+	//vec3 center = {0.0f, 0.0f, 0.0f};
+	//vec3 up = {0, 1, 0};
+	
+	//glm_lookat(eye, center, up, view);
+	
+	glm_mat4_identity(irodeo_gfx_state.view_matrix);
+
+	//glm_perspective(glm_rad(60.f), 640.f / 480.f, 0.1f, 100.0f, proj);
+
+	// TODO: figure out if why 'zo' is correct
+	// but 'no' is incorrect
+	glm_ortho_rh_zo( 
+		0,
+		(float)rodeo_window_screen_width_get(),
+		(float)rodeo_window_screen_height_get(),
+		0,
+		// near
+		-0.1f,
+		// far
+		100.0f,
+		irodeo_gfx_state.proj_matrix
+	);
+
+	bgfx_set_view_transform(0, irodeo_gfx_state.view_matrix, irodeo_gfx_state.proj_matrix);
+	bgfx_set_view_rect(0, 0, 0, rodeo_window_screen_width_get(), rodeo_window_screen_height_get());
+	bgfx_touch(0);
+
+	irodeo_gfx_render_buffer_transient_alloc();
+
+	irodeo_gfx_state.frame_start = irodeo_gfx_state.frame_end;
+}
+
+void
+rodeo_gfx_frame_end(void)
+{
+	rodeo_gfx_renderer_flush();
+
+	bgfx_frame(false);
+
+	#ifndef __EMSCRIPTEN__
+		irodeo_gfx_frame_stall();
+	#endif
+	irodeo_gfx_state.frame_count += 1;
+	irodeo_gfx_state.frame_end = (uint32_t)SDL_GetPerformanceCounter();
+	//
+#ifndef __EMSCRIPTEN__
+	//irodeo_gfx_state.frame_time = ((float)(irodeo_gfx_state.frame_end - irodeo_gfx_state.frame_start) * 1000.0f / (float)SDL_GetPerformanceFrequency());
+	irodeo_gfx_state.frame_time = (1.0f/60.f) * 1000; //((float)(state.end_frame - state.start_frame) * 1000.0f / (float)SDL_GetPerformanceFrequency());
+#else
+	irodeo_gfx_state.frame_time = (1.0f/60.f) * 1000; //((float)(state.end_frame - state.start_frame) * 1000.0f / (float)SDL_GetPerformanceFrequency());
+#endif
+}
+
+float
+rodeo_gfx_frame_time_get(void)
+{
+	return irodeo_gfx_state.frame_time; //(float)bgfx_get_stats()->cpuTimeFrame;
+}
+
+float
+rodeo_gfx_frame_perSecond_get(void)
+{
+	return 1.0f / (rodeo_gfx_frame_time_get() / 1000.0f);
+}
+
+// measures how much time there is left in the remaining frame until
+// the frame target time is reached. If we surpassed the target time
+// then this will be negative
+float
+irodeo_gfx_frame_remaining_get(void)
+{
+	#ifdef __EMSCRIPTEN__
+		float target = 60.0f;
+	#else
+		float target = (float)rodeo_gfx_frame_limit_get();
+	#endif
+
+	float result = (1/target * 1000.0f) - ((float)(SDL_GetPerformanceCounter() - irodeo_gfx_state.frame_start) / (float)SDL_GetPerformanceFrequency() * 1000.0f);
+
+	return result;
+}
+
+
+// used internally at the end of every frame to fill for time
+// in order to reach the desired framerate
+void
+irodeo_gfx_frame_stall(void)
+{
+	// if no frame limit then run as fast as possible
+	if(rodeo_gfx_frame_limit_get() == 0)
+	{
+		return;
+	}
+
+	// sleep isnt perfectly accurate so we sleep for a slightly shorter
+	// amount of time
+	float stall_time = irodeo_gfx_frame_remaining_get();
+	if(stall_time > 0.0005)
+	{
+		SDL_Delay((uint32_t)(stall_time * 0.9995));
+	}
+
+	// then we spinlock for the small remaining amount of time
+	stall_time = irodeo_gfx_frame_remaining_get();
+	while(stall_time > 0.0005) {
+		stall_time = irodeo_gfx_frame_remaining_get();
+	}
+}
+
+void
+rodeo_gfx_renderer_flush(void)
+{
+	// set default texture
+	bgfx_set_texture(
+		0,
+		irodeo_gfx_state.texture_uniforms[0],
+		rodeo_gfx_texture_2d_default_get()->internal_texture->texture_bgfx,
+		UINT32_MAX
+	);
+	if(irodeo_gfx_state.active_texture_p != NULL)
+	{
+		// set dynamic texture
+		bgfx_set_texture(
+			1,
+			irodeo_gfx_state.texture_uniforms[1],
+			*irodeo_gfx_state.active_texture_p,
+			UINT32_MAX
+		);
+	}
+	else
+	{
+		// set to default if none exists
+		bgfx_set_texture(
+			1,
+			irodeo_gfx_state.texture_uniforms[1],
+			rodeo_gfx_texture_2d_default_get()->internal_texture->texture_bgfx,
+			UINT32_MAX
+		);
+	}
+
+	if(irodeo_gfx_state.vertex_size > 0)
+	{
+		bgfx_set_state(
+			BGFX_STATE_CULL_CW |
+			BGFX_STATE_WRITE_RGB |
+			BGFX_STATE_WRITE_A |
+			//BGFX_STATE_DEPTH_TEST_LESS |
+			//BGFX_STATE_MSAA |
+			BGFX_STATE_BLEND_ALPHA,
+			0
+		);
+
+		// upload remaining batched vertices
+		bgfx_set_transient_vertex_buffer(0, &irodeo_gfx_state.vertex_buffer_handle, 0, irodeo_gfx_state.vertex_size);
+		//const bgfx_memory_t* vbm = bgfx_copy(irodeo_gfx_state.batched_vertices, sizeof(rodeo_gfx_vertex_t) * irodeo_gfx_state.vertex_size);
+		//bgfx_update_dynamic_vertex_buffer(irodeo_gfx_state.vertex_buffer_handle,  0, vbm);
+
+		// upload remaining batched indices
+		bgfx_set_transient_index_buffer(&irodeo_gfx_state.index_buffer_handle, 0, irodeo_gfx_state.index_size);
+		//bgfx_set_dynamic_index_buffer(irodeo_gfx_state.index_buffer_handle, 0, irodeo_gfx_state.index_size);
+		//const bgfx_memory_t* ibm = bgfx_copy(irodeo_gfx_state.batched_indices, sizeof(uint16_t) * irodeo_gfx_state.index_size);
+		//bgfx_update_dynamic_index_buffer(irodeo_gfx_state.index_buffer_handle, 0, ibm);
+
+
+		// submit vertices & batches
+		bgfx_submit(0, irodeo_gfx_state.program_shader, 0, BGFX_DISCARD_NONE);
+
+		// reset arrays
+		irodeo_gfx_state.vertex_size = 0;
+		irodeo_gfx_state.index_size = 0;
+		irodeo_gfx_state.index_count = 0;
+
+		// allocate new buffers
+		irodeo_gfx_render_buffer_transient_alloc();
+	}
+	irodeo_gfx_state.active_texture_p = NULL;
+}
+
+const rodeo_gfx_texture_2d_t*
+rodeo_gfx_texture_2d_default_get(void)
+{
+	return &irodeo_gfx_state.default_texture;
+}
+
+rodeo_gfx_texture_2d_t
+rodeo_gfx_texture_2d_create_from_RGBA8(
+	const uint16_t width,
+	const uint16_t height,
+	const uint8_t memory[]
+)
+{
+	rodeo_gfx_texture_2d_t texture;
+	texture.internal_texture = malloc(sizeof(irodeo_gfx_texture_internal_t));
+	bgfx_copy(memory, (uint32_t)width * (uint32_t)height * sizeof(uint8_t) * 4);
+	texture.internal_texture->texture_bgfx =
+			bgfx_create_texture_2d(
+				width,
+				height,
+				false,
+				0,
+				BGFX_TEXTURE_FORMAT_RGBA8,
+				BGFX_SAMPLER_UVW_CLAMP | BGFX_SAMPLER_MAG_POINT,
+				bgfx_copy(memory, (uint32_t)width * (uint32_t)height * sizeof(uint8_t) * 4)
+			);
+
+	texture.width = width;
+	texture.height = height;
+
+	return texture;
+}
+
+void
+rodeo_gfx_texture_2d_destroy(rodeo_gfx_texture_2d_t *texture)
+{
+	bgfx_destroy_texture(texture->internal_texture->texture_bgfx);
+	free(texture->internal_texture);
+}
+
+void
+rodeo_gfx_rectangle_draw(
+	const rodeo_rectangle_t *rectangle,
+	const rodeo_color_RGBAFloat_t *color
+)
+{
+	rodeo_gfx_texture_2d_draw(
+		rectangle,
+		NULL,
+		color,
+		NULL
+	);
+}
+
+void
+rodeo_gfx_texture_2d_draw(
+	// cant be NULL
+	const rodeo_rectangle_t *destination,
+	// default: entire texture
+	const rodeo_rectangle_t *source,
+	// default: white
+	const rodeo_color_RGBAFloat_t *color,
+	// default: default texture
+	const rodeo_gfx_texture_2d_t *texture
+)
+{
+	// whether to use default or custom texture
+	float texture_uniform_slot = 0.0;
+
+	rodeo_rectangle_t source_applied;
+	if(source != NULL && texture != NULL)
+	{
+		source_applied = (rodeo_rectangle_t){
+			.x = source->x / (float)texture->width,
+			.y = source->y / (float)texture->height,
+			.width = source->width / (float)texture->width,
+			.height = source->height / (float)texture->height,
+		};
+	}
+	else
+	{
+		source_applied = (rodeo_rectangle_t){
+			.x = 0.0f,
+			.y = 0.0f,
+			.width = 1.0f,
+			.height = 1.0f,
+		};
+	}
+
+	rodeo_color_RGBAFloat_t color_applied;
+	if(color != NULL)
+	{
+		color_applied = *color;
+	}
+	else
+	{
+		color_applied = (rodeo_color_RGBAFloat_t){
+			{ 1.0f, 1.0f, 1.0f, 1.0f }
+		};
+	}
+
+	// if not using texture: use default instead
+	// otherwise check what current texture is active
+	//	if none or the same: set it
+	//	if different: flush and then set it
+	if(texture != NULL)
+	{
+		if(irodeo_gfx_state.active_texture_p != NULL)
+		{
+			if(&texture->internal_texture->texture_bgfx != irodeo_gfx_state.active_texture_p)
+			{
+				rodeo_gfx_renderer_flush();
+			}
+		}
+		texture_uniform_slot = 1.0;
+		irodeo_gfx_state.active_texture_p = &texture->internal_texture->texture_bgfx;
+	}
+
+
+	if(irodeo_gfx_state.vertex_size < mrodeo_vertex_size_max)
+	{
+		irodeo_gfx_state.batched_vertices[irodeo_gfx_state.vertex_size] =
+			(rodeo_gfx_vertex_t)
+			{ 
+				.x = destination->width + destination->x,
+				.y = destination->height + destination->y,
+				//.z = 0.0f, 
+				.color = color_applied,
+				.texture_id = texture_uniform_slot,
+				.texture_x = source_applied.width + source_applied.x,
+				.texture_y = source_applied.height + source_applied.y,
+			};
+		irodeo_gfx_state.vertex_size += 1;
+		irodeo_gfx_state.batched_vertices[irodeo_gfx_state.vertex_size] =
+			(rodeo_gfx_vertex_t)
+			{ 
+				.x = destination->width + destination->x,
+				.y = destination->y,
+				//.z = 0.0f, 
+				.color = color_applied,
+				.texture_id = texture_uniform_slot,
+				.texture_x = source_applied.width + source_applied.x,
+				.texture_y = source_applied.y,
+			};
+		irodeo_gfx_state.vertex_size += 1;
+		irodeo_gfx_state.batched_vertices[irodeo_gfx_state.vertex_size] =
+			(rodeo_gfx_vertex_t)
+			{ 
+				.x = destination->x,
+				.y = destination->y,
+				//.z = 0.0f, 
+				.color = color_applied,
+				.texture_id = texture_uniform_slot,
+				.texture_x = source_applied.x,
+				.texture_y = source_applied.y,
+			};
+		irodeo_gfx_state.vertex_size += 1;
+		irodeo_gfx_state.batched_vertices[irodeo_gfx_state.vertex_size] =
+			(rodeo_gfx_vertex_t)
+			{ 
+				.x = destination->x,
+				.y = destination->height + destination->y,
+				//.z = 0.0f, 
+				.color = color_applied,
+				.texture_id = texture_uniform_slot,
+				.texture_x = source_applied.x,
+				.texture_y = source_applied.height + source_applied.y,
+			};
+		irodeo_gfx_state.vertex_size += 1;
+
+		irodeo_index_type_t indices[] =
+		{
+			0, 1, 3,
+			1, 2, 3
+			//2, 1, 0,
+			//2, 3, 1
+		};
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[0];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[1];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[2];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[3];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[4];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.batched_indices[irodeo_gfx_state.index_size] = irodeo_gfx_state.index_count + indices[5];
+		irodeo_gfx_state.index_size += 1;
+		irodeo_gfx_state.index_count += 4;
+	}
+
+	if(irodeo_gfx_state.vertex_size >= mrodeo_vertex_size_max)
+	{
+		rodeo_gfx_renderer_flush();
+	}
+}
+
+rodeo_gfx_texture_2d_t
+rodeo_gfx_texture_2d_create_from_path(cstr path)
+{
+	// load image to surface
+	SDL_Surface *surface = IMG_Load(cstr_str(&path));
+	if(surface == NULL)
+	{
+		rodeo_log(
+			rodeo_logLevel_error,
+			"Loading texture from image failed: %s",
+			IMG_GetError()
+		);
+		return (rodeo_gfx_texture_2d_t){0};
+	}
+
+	// check and handle a color key for transparency
+	// not sure if I actually need this...
+	//uint32_t color_key;
+	//if(SDL_GetColorKey(surface, &color_key) == 0)
+	//{
+	//	SDL_SetColorKey(surface, SDL_TRUE, color_key);
+	//}
+
+	// convert pixel format of surface into RGBA8
+	SDL_Surface *converted_surface =
+		SDL_ConvertSurfaceFormat(
+			surface,
+			// pixel format needs to be backwards
+			// of what bgfx uses for some reason
+			SDL_PIXELFORMAT_ABGR8888,
+			0
+		);
+	if(converted_surface == NULL)
+	{
+		rodeo_log(
+			rodeo_logLevel_error,
+			"Converting image to RGBA8 while loading texture failed: %s",
+			SDL_GetError()
+		);
+		SDL_FreeSurface(surface);
+		return (rodeo_gfx_texture_2d_t){0};
+	}
+
+	// load the pixel data into our own texture
+	rodeo_gfx_texture_2d_t texture = rodeo_gfx_texture_2d_create_from_RGBA8(
+		(uint16_t)converted_surface->w,
+		(uint16_t)converted_surface->h,
+		converted_surface->pixels
+	);
+
+	SDL_FreeSurface(surface);
+	SDL_FreeSurface(converted_surface);
+
+	return texture;
+}
+
+uint64_t
+rodeo_gfx_frame_count_get(void)
+{
+	return irodeo_gfx_state.frame_count;
+}
+
+void
+rodeo_gfx_frame_limit_set(uint32_t limit)
+{
+	#ifdef __EMSCRIPTEN__
+		rodeo_log(
+			rodeo_logLevel_warning,
+			"Framerate limit cannot be set on web platform. Limit is enforced by platform to 60fps"
+		);
+	#else
+		irodeo_gfx_state.frame_limit = limit;
+	#endif
+}
+
+uint32_t
+rodeo_gfx_frame_limit_get(void)
+{
+	#ifdef __EMSCRIPTEN__
+		return 60;
+	#else
+		return irodeo_gfx_state.frame_limit;
+	#endif
+}
+
+cstr
+rodeo_gfx_renderer_name_get(void)
+{
+	return cstr_from(
+		bgfx_get_renderer_name(bgfx_get_renderer_type())
+	);
+}
+
+bgfx_shader_handle_t
+irodeo_gfx_shader_load(const cstr path)
+{
+	const char* path_cstr = cstr_str(&path);
+
+	FILE *file = fopen(path_cstr, "rb");
+
+	if(!file)
+	{
+		rodeo_log(
+			rodeo_logLevel_error,
+			"Shader file \"%s\" not found",
+			path_cstr
+		);
+		return (bgfx_shader_handle_t)BGFX_INVALID_HANDLE;
+	}
+
+	fseek(file, 0, SEEK_END);
+	int64_t file_size_temp = ftell(file);
+	if(file_size_temp < 0)
+	{
+		rodeo_log(
+			rodeo_logLevel_error,
+			"Failed to get current file position of given stream(ftell() error)"
+		);
+		exit(EXIT_FAILURE);
+	}
+	if((file_size_temp + 1) > UINT32_MAX)
+	{
+		rodeo_log(
+			rodeo_logLevel_error,
+			"File size larger then what bgfx can allocate"
+		);
+		exit(EXIT_FAILURE);
+	}
+	uint32_t file_size = (uint32_t)file_size_temp;
+	fseek(file, 0, SEEK_SET);
+
+	
+	const bgfx_memory_t *mem = bgfx_alloc(file_size + 1);
+	fread(mem->data, 1, file_size, file);
+	mem->data[mem->size - 1] = '\0';
+	fclose(file);
+
+	bgfx_shader_handle_t shader = bgfx_create_shader(mem);
+	rodeo_log(
+		rodeo_logLevel_info,
+		"Shader loaded with idx: %"PRIu8"",
+		shader.idx
+	);
+
+	return shader;
+}
+
+void
+irodeo_gfx_render_buffer_transient_alloc(void)
+{
+	bgfx_alloc_transient_vertex_buffer(&irodeo_gfx_state.vertex_buffer_handle, mrodeo_vertex_size_max, &irodeo_gfx_state.vertex_layout);
+	bgfx_alloc_transient_index_buffer(&irodeo_gfx_state.index_buffer_handle, mrodeo_index_size_max, false);
+	irodeo_gfx_state.batched_vertices = (rodeo_gfx_vertex_t*)irodeo_gfx_state.vertex_buffer_handle.data;
+	irodeo_gfx_state.batched_indices = (irodeo_index_type_t*)irodeo_gfx_state.index_buffer_handle.data;
+}
+