Initial version of sprite renderer code and fixed bugs related to shaders, camera and editor

README.md

@@ -155,10 +155,13 @@
 
 - ## TODO
 
+	- Fix bugs with sprite batch renderer not working with projection matrix
+	- Implement necessary changes to run Soloud on linux
+	- Get rid of pkg-confg and system-installed SDL2 dependancy on linux and instead put custom compiled SDL libs in third_party similar to how we're handling it in windows
+	- Add fallback shader
+	- Implement Game States
 	- Store Materials in new format supported by parser
 	- Add model description file which has the same syntax supported by parser and modify old blender exporter to conform to new standards
-	- Implement sound/listener loading from scene file
-	- Finish loading scene from file
 	- Update makefiles to be able to compile the code in it's current state
 	- Find a solution for the asset import/export situation by either updating the blender exporter or adding assimp as dependancy
 	- Fix bugs with sound sources not updating
@@ -331,3 +334,9 @@
 	* Changed Config to read/write using new Parser and Parser_Objects
 	* Implemented Reading/Writing keybindings using new parser object
 	* Replaced OpenAL with Soloud with SDL2 backend
+	* Implemented sound/listener loading from scene file
+	* Finished loading scene from file
+	* Initial implementation of immediate-mode batched sprite render
+	* Fixed bugs with shader include file pre-processor
+	* Fixed bugs with editor's camera property viewer
+	* Fixed bugs related to changing camera projection

assets/shaders/sprite.frag

@@ -0,0 +1,14 @@
+//include version.glsl
+
+in vec2 uv;
+in vec4 color;
+
+uniform sampler2D sampler;
+
+out vec4 frag_color;
+
+void main()
+{
+	frag_color = color * texture(sampler, uv);
+	//frag_color = vec4(0, 1, 0, 1);
+}

assets/shaders/sprite.vert

@@ -0,0 +1,17 @@
+//include version.glsl
+
+uniform mat4 mvp;
+
+in vec3 vPosition;
+in vec2 vUV;
+in vec4 vColor;
+
+out vec2 uv;
+out vec4 color;
+
+void main()
+{
+	gl_Position = mvp * vec4(vPosition, 1.0);
+	uv = vUV;
+	color = vColor;
+}

src/common/log.c

@@ -74,6 +74,18 @@ void log_to_stdout(const char* message, ...)
 	printf("\n%s", COL_RESET);
 }
 
+void log_raw(const char* str, ...)
+{
+	va_list console_list, file_list;
+	va_start(console_list, str);
+	va_copy(file_list, console_list);
+	vfprintf(log_file, str, file_list);
+	vprintf(str, console_list);
+	va_end(console_list);
+	va_end(file_list);
+	fflush(log_file);
+}
+
 void log_message(const char* message, ...)
 {
 	printf("%sMSG : ", COL_DEFAULT);

src/common/log.h

@@ -9,6 +9,7 @@ void  log_message(const char* message, ...);
 void  log_warning(const char* message, ...);
 void  log_error(const char* context, const char* error, ...);
 void  log_to_stdout(const char* message, ...); /* Only use when logging is not initialized */
+void  log_raw(const char* str, ...);
 FILE* log_file_handle_get(void);
 void  log_file_handle_set(FILE* file);
 

src/libsymmetry/camera.c

@@ -5,6 +5,7 @@
 #include "../common/array.h"
 #include "framebuffer.h"
 #include "texture.h"
+#include "game.h"
 #include "bounding_volumes.h"
 
 #include "../common/utils.h"
@@ -44,8 +45,8 @@ void camera_create(struct Entity* entity, int width, int height)
 	camera->farz       = 1000.f;
 	camera->nearz      = 0.1f;
 	camera->fov        = 60.f;
-	camera->ortho      = 0;
-	camera->resizeable = 1;
+	camera->ortho      = false;
+	camera->resizeable = true;
 	float aspect_ratio = (float)width / (float)height;
 	camera->aspect_ratio = aspect_ratio <= 0.f ? (4.f / 3.f) : aspect_ratio;
 	mat4_identity(&camera->view_mat);
@@ -62,6 +63,9 @@ void camera_update_view_proj(struct Entity* entity)
 {
 	struct Camera* camera = &entity->camera;
 	mat4_identity(&camera->view_proj_mat);
+	if(camera->ortho)
+		mat4_mul(&camera->view_proj_mat, &camera->view_proj_mat, &camera->proj_mat);
+	else
 		mat4_mul(&camera->view_proj_mat, &camera->proj_mat, &camera->view_mat);
 	update_frustum(camera);
 }
@@ -92,7 +96,11 @@ void camera_update_proj(struct Entity* entity)
 	}
 	else
 	{
-		mat4_ortho(&camera->proj_mat, -1, 1, -1, 1, camera->nearz, camera->farz);
+		int width, height;
+		struct Game_State* game_state = game_state_get();
+		platform->window.get_size(game_state->window, &width, &height);
+
+		mat4_ortho(&camera->proj_mat, 0, width, height, 0, camera->nearz, camera->farz);
 	}
 	camera_update_view_proj(entity);
 }

src/libsymmetry/editor.c

@@ -373,19 +373,48 @@ void editor_update(float dt)
 					{
 						if(nk_tree_push(context, NK_TREE_TAB, "Camera", NK_MAXIMIZED))
 						{
+							bool update = false;
 							struct Camera* camera = &entity->camera;
 							
+							if(!camera->ortho)
+							{
+								nk_layout_row_dynamic(context, row_height, 1);
+								float new_fov = nk_propertyf(context, "Fov", 30.f, camera->fov, 90.f, 0.1f, 1.f);
+								if(new_fov != camera->fov)
+								{
+									camera->fov = new_fov;
+									update = true;
+								}
+
 								nk_layout_row_dynamic(context, row_height, 2);
 								nk_label(context, "Aspect Ratio", NK_TEXT_ALIGN_LEFT); nk_labelf(context, NK_TEXT_ALIGN_RIGHT, "%.5f", camera->aspect_ratio);
+							}
 
+							nk_layout_row_dynamic(context, row_height, 1); nk_label(context, "Clear Color", NK_TEXT_ALIGN_CENTERED);
 							nk_layout_row_dynamic(context, row_height, 1);
-							nk_property_float(context, "Fov", 45.f, &camera->fov, 90.f, 1.f, 5.f);
+							editor_widget_color_combov4(context, &camera->clear_color, 200, 300);
 
 							nk_layout_row_dynamic(context, row_height, 1);
-							nk_property_float(context, "NearZ", 0.01f, &camera->nearz, camera->farz, 0.1f, 1.f);
+							float new_near_z = nk_propertyf(context, "NearZ", -FLT_MAX, camera->nearz, camera->farz, 0.1f, 1.f);
+							if(new_near_z != camera->nearz)
+							{
+								camera->nearz = new_near_z;
+								update = true;
+							}
 							
 							nk_layout_row_dynamic(context, row_height, 1);
-							nk_property_float(context, "FarZ", camera->nearz, &camera->farz, FLT_MAX, 1.f, 5.f);
+							float new_far_z = nk_propertyf(context, "FarZ", camera->nearz, camera->farz, FLT_MAX, 0.1f, 2.f);
+							if(new_far_z != camera->farz)
+							{
+								camera->farz = new_far_z;
+								update = true;
+							}
+
+							if(update)
+							{
+								if(!camera->ortho) camera_update_view(entity);
+								camera_update_proj(entity);
+							}
 
 							nk_tree_pop(context);
 						}

src/libsymmetry/game.c

@@ -24,6 +24,7 @@
 #include "gl_load.h"
 #include "gui.h"
 #include "editor.h"
+#include "sprite.h"
 #include "../common/parser.h"
 #include "../common/hashmap.h"
 #include "../common/variant.h"
@@ -216,6 +217,12 @@ void scene_setup(void)
 		struct Entity* player = entity_find("player");
 		game_state->player_node = player->id;
 
+		/*struct Camera* camera = &player->camera;
+		camera->ortho = true;
+		camera->farz  =  1.f;
+		camera->nearz = -1.f;
+		camera_update_proj(player);*/
+
 		/*struct Entity* suz = entity_find("Suzanne");
 		struct Entity* sound_ent = scene_add_as_child("Sound_Ent", ET_SOUND_SOURCE, suz->id);
 		struct Sound_Source* sound_source = &sound_ent->sound_source;
@@ -363,6 +370,36 @@ void debug(float dt)
     transform_rotate(model, &x_axis, 25.f * dt, TS_WORLD);
 	vec3 amount = {0, 0, -5 * dt};
 	transform_translate(model, &amount, TS_LOCAL);
+
+	struct Sprite_Batch* batch = get_batch();
+
+	sprite_batch_begin(batch);
+	static struct Sprite sprite;
+
+	sprite.vertices[0].pos.x = 0.f; sprite.vertices[0].pos.y = 0.f; sprite.vertices[0].pos.z = 0.f;
+	sprite.vertices[1].pos.x = 1.f; sprite.vertices[1].pos.y = 0.f; sprite.vertices[1].pos.z = 0.f;
+	sprite.vertices[2].pos.x = 0.f; sprite.vertices[2].pos.y = 1.f; sprite.vertices[2].pos.z = 0.f;
+	sprite.vertices[3].pos.x = 0.f; sprite.vertices[3].pos.y = 1.f; sprite.vertices[3].pos.z = 0.f;
+	sprite.vertices[4].pos.x = 1.f; sprite.vertices[4].pos.y = 1.f; sprite.vertices[4].pos.z = 0.f;
+	sprite.vertices[5].pos.x = 1.f; sprite.vertices[5].pos.y = 0.f; sprite.vertices[5].pos.z = 0.f;
+
+	sprite.vertices[0].uv.x = 0.f; sprite.vertices[0].uv.y = 0.f;
+	sprite.vertices[1].uv.x = 1.f; sprite.vertices[1].uv.y = 0.f;
+	sprite.vertices[2].uv.x = 0.f; sprite.vertices[2].uv.y = 1.f;
+	sprite.vertices[3].uv.x = 0.f; sprite.vertices[3].uv.y = 1.f;
+	sprite.vertices[4].uv.x = 1.f; sprite.vertices[4].uv.y = 1.f;
+	sprite.vertices[5].uv.x = 1.f; sprite.vertices[5].uv.y = 0.f;
+
+	sprite.vertices[0].color.x = 0.f; sprite.vertices[0].color.y = 0.f; sprite.vertices[0].color.z = 0.f; sprite.vertices[0].color.w = 1.f;
+	sprite.vertices[1].color.x = 1.f; sprite.vertices[1].color.y = 0.f; sprite.vertices[1].color.z = 0.f; sprite.vertices[1].color.w = 1.f;
+	sprite.vertices[2].color.x = 0.f; sprite.vertices[2].color.y = 1.f; sprite.vertices[2].color.z = 0.f; sprite.vertices[2].color.w = 1.f;
+	sprite.vertices[3].color.x = 1.f; sprite.vertices[3].color.y = 1.f; sprite.vertices[3].color.z = 0.f; sprite.vertices[3].color.w = 1.f;
+	sprite.vertices[4].color.x = 1.f; sprite.vertices[4].color.y = 1.f; sprite.vertices[4].color.z = 0.f; sprite.vertices[4].color.w = 1.f;
+	sprite.vertices[5].color.x = 1.f; sprite.vertices[5].color.y = 1.f; sprite.vertices[5].color.z = 0.f; sprite.vertices[5].color.w = 1.f;
+
+	sprite_batch_add_sprite(batch, &sprite);
+
+	sprite_batch_end(batch);
 }
 
 bool run(void)

src/libsymmetry/gl_load.h

@@ -8,7 +8,6 @@
 
 #else
 
-#include <SDL2/SDL_opengl.h>
 
 #define SYMMETRY_GL_LIST \
     /*  ret, name, params */ \

src/libsymmetry/renderer.c

@@ -18,6 +18,7 @@
 #include "geometry.h"
 #include "material.h"
 #include "editor.h"
+#include "sprite.h"
 #include "../common/variant.h"
 #include "../common/common.h"
 
@@ -38,6 +39,8 @@ static int num_culled = 0, num_rendered = 0, num_indices = 0;
 static int num_culled_slot = -1, num_rendered_slot = -1, num_indices_slot = -1;
 
 
+static struct Sprite_Batch* sprite_batch = NULL;
+
 void on_framebuffer_size_change(int width, int height);
 
 void renderer_init(void)
@@ -117,6 +120,16 @@ void renderer_init(void)
 	num_culled_slot   = editor_debugvar_slot_create("Culled Geom",   VT_INT);
 	num_rendered_slot = editor_debugvar_slot_create("Rendered Geom", VT_INT);
 	num_indices_slot  = editor_debugvar_slot_create("Total Indices", VT_INT);
+
+	sprite_batch = malloc(sizeof(*sprite_batch));
+	if(!sprite_batch)
+	{
+		log_error("renderer:init", "Failed to allocated sprite batch");
+	}
+	else
+	{
+		sprite_batch_create(sprite_batch, "sprite_map.tga", "sprite.vert", "sprite.frag", GL_TRIANGLES);
+	}
 }
 
 void renderer_draw(struct Entity* active_viewer)
@@ -391,11 +404,29 @@ void renderer_draw(struct Entity* active_viewer)
 		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 	}
 
+	/* Render 2D stuff */
+	shader_bind(sprite_batch->shader);
+	{
+		static mat4 ortho_mat;
+		mat4_identity(&ortho_mat);
+		/*int width, height;
+		struct Game_State* game_state = game_state_get();
+		platform->window.get_size(game_state->window, &width, &height);
+
+		mat4_ortho(&ortho_mat, 0, width, height, 0, -1.f, 1.f);*/
+		shader_set_uniform_mat4(sprite_batch->shader, "mvp", &ortho_mat);
+
+		sprite_batch_render(sprite_batch);
+	}
+	shader_unbind();
+
+	/* Render UI */
 	gui_render(NK_ANTI_ALIASING_ON);
 }
 
 void renderer_cleanup(void)
 {
+	free(sprite_batch);
 	gui_cleanup();
 	geom_remove(quad_geo);
 	framebuffer_remove(def_fbo);
@@ -447,6 +478,11 @@ int renderer_check_glerror(const char* context)
 	return error;
 }
 
+struct Sprite_Batch * get_batch(void)
+{
+	return sprite_batch;
+}
+
 void renderer_debug_draw_enabled(bool enabled)
 {
     struct Hashmap* cvars = platform->config.get();

src/libsymmetry/renderer.h

@@ -32,6 +32,7 @@ struct Render_Settings
 };
 
 struct Entity;
+struct Sprite_Batch;
 
 void renderer_settings_get(struct Render_Settings* settings);
 void renderer_settings_set(const struct Render_Settings* settings);
@@ -42,4 +43,6 @@ void renderer_clearcolor_set(float r, float g, float b, float a);
 void renderer_debug_draw_enabled(bool enabled);
 int  renderer_check_glerror(const char* context);
 
+struct Sprite_Batch* get_batch(void);
+
 #endif

src/libsymmetry/shader.c

@@ -13,28 +13,24 @@
 #include <string.h>
 #include <assert.h>
 
-// Constants for locations of attributes inside all shaders
-const int POSITION_LOC = 0;
-const int NORMAL_LOC   = 1;
-const int UV_LOC       = 2;
-const int COLOR_LOC    = 3;
-
 static uint* shader_list;
 static int*  empty_indices;
 
+#define MAX_INCLUDE_LINE_LEN 256
+
 void debug_print_shader(const char* shaderText)
 {
 	size_t len = strlen(shaderText);
 	int line_count = 1;
-	printf("%d. ", line_count);
+	log_raw("%d. ", line_count);
 	for(uint i = 0; i < len; i++)
 	{
 		if(shaderText[i] != '\n')
-			printf("%c", shaderText[i]);
+			log_raw("%c", shaderText[i]);
 		else
-			printf("\n%d. ", ++line_count);
+			log_raw("\n%d. ", ++line_count);
 	}
-	printf("\n END_DEBUG_PRINT\n\n");
+	log_raw("\n END_DEBUG_PRINT\n\n");
 }
 
 char* run_preprocessor(char* shader_text)
@@ -42,40 +38,32 @@ char* run_preprocessor(char* shader_text)
 	char* include_loc = strstr(shader_text, "//include");
 	if(include_loc)
 	{
-		char* line_end = strchr(include_loc, '\n');
-		int line_size  = line_end - include_loc;
-		char* inc_line = malloc((sizeof(char) * line_size) + 1);
-		strncpy(inc_line, include_loc, line_size);
-		inc_line[line_size] = '\0';
+		char inc_line[MAX_INCLUDE_LINE_LEN];
+		memset(inc_line, '\0', MAX_INCLUDE_LINE_LEN);
+
+		char fmt_str[64];
+		snprintf(fmt_str, 64, "//include %%%d[^\r\n]", MAX_INCLUDE_LINE_LEN);
+		sscanf(shader_text, fmt_str, inc_line);
 
 		char* filename = strtok(inc_line, " ");
 		while(filename)
 		{
-			filename = strtok(NULL, " ");
 			if(filename)
 			{
 				char* path = str_new("shaders/");
 				path = str_concat(path, filename);
-                char* file = platform->file.read(DIRT_INSTALL, path, "r", NULL);
-				char* shader_copy = str_new(shader_text);
-				char* temp = realloc(shader_text, (strlen(shader_text) + strlen(file) + 2));
-				if(temp)
+                char* file_contents = platform->file.read(DIRT_INSTALL, path, "rb", NULL);
+				if(file_contents)
 				{
-					shader_text = temp;
-					strcpy(shader_text, file);
-					strcat(shader_text, shader_copy);
-				}
-				else
-				{
-					log_warning("Realloc failed in Shader::run_preprocessor");
-				}
-
+					char* shader_text_new = str_new("%s\n%s", file_contents, shader_text);
+					free(shader_text);
+					free(file_contents);
 					free(path);
-				free(shader_copy);
-				free(file);
+					shader_text = shader_text_new;
 				}
 			}
-		free(inc_line);
+			filename = strtok(NULL, " ");
+		}
 	}
 	return shader_text;
 }
@@ -96,8 +84,8 @@ int shader_create(const char* vert_shader_name, const char* frag_shader_name)
 	GLuint vert_shader = glCreateShader(GL_VERTEX_SHADER);
 	GLuint frag_shader = glCreateShader(GL_FRAGMENT_SHADER);
 
-    char* vert_source = platform->file.read(DIRT_INSTALL, vs_path, "r", NULL);
-    char* frag_source = platform->file.read(DIRT_INSTALL, fs_path, "r", NULL);
+    char* vert_source = platform->file.read(DIRT_INSTALL, vs_path, "rb", NULL);
+    char* frag_source = platform->file.read(DIRT_INSTALL, fs_path, "rb", NULL);
 
 	assert(vert_source != NULL);
 	assert(frag_source != NULL);
@@ -164,10 +152,10 @@ int shader_create(const char* vert_shader_name, const char* frag_shader_name)
 	glAttachShader(program, frag_shader);
 
 	// Bind attribute locations
-	glBindAttribLocation(program, POSITION_LOC, "vPosition");
-	glBindAttribLocation(program, NORMAL_LOC,   "vNormal");
-	glBindAttribLocation(program, UV_LOC,       "vUV");
-	glBindAttribLocation(program, COLOR_LOC,    "vColor");
+	glBindAttribLocation(program, AL_POSITION, "vPosition");
+	glBindAttribLocation(program, AL_NORMAL,   "vNormal");
+	glBindAttribLocation(program, AL_UV,       "vUV");
+	glBindAttribLocation(program, AL_COLOR,    "vColor");
 	renderer_check_glerror("shader:create");
 	glLinkProgram(program);
 

src/libsymmetry/shader.h

@@ -3,6 +3,15 @@
 
 #include "../common/linmath.h"
 
+// Constants for locations of attributes inside all shaders
+enum Attribute_Location
+{
+	AL_POSITION = 0,
+    AL_NORMAL   = 1,
+    AL_UV       = 2,
+    AL_COLOR    = 3
+};
+
 enum Uniform_Type
 {
 	UT_FLOAT = 0,

src/libsymmetry/sprite.c

@@ -0,0 +1,137 @@
+#include "sprite.h"
+#include "texture.h"
+#include "shader.h"
+#include "renderer.h"
+#include "../common/log.h"
+#include "../common/array.h"
+#include "gl_load.h"
+
+#include <assert.h>
+
+
+static int sprite_count = 0;
+
+void sprite_init(void)
+{
+	
+}
+
+void sprite_cleanup(void)
+{
+
+}
+
+void sprite_batch_create(struct Sprite_Batch* batch, const char* texture_name, const char* vert_shader, const char* frag_shader, int draw_mode)
+{
+	assert(batch);
+	memset(&batch->sprites[0], '\0', sizeof(struct Sprite) * SPRITE_BATCH_SIZE);
+	glGenVertexArrays(1, &batch->vao);
+	
+	glBindVertexArray(batch->vao);
+
+	glGenBuffers(1, &batch->vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, batch->vbo);
+	glBufferData(GL_ARRAY_BUFFER,
+		         sizeof(struct Vertex) * MAX_SPRITE_VERTICES * SPRITE_BATCH_SIZE,
+		         NULL,
+		         GL_STREAM_DRAW);
+	renderer_check_glerror("sprite_batch_create:glBufferData");
+
+	// Position
+	glVertexAttribPointer(AL_POSITION, 3, GL_FLOAT, GL_FALSE, sizeof(struct Vertex), 0); 
+	renderer_check_glerror("sprite_batch_create:glVertexAttribPointer");
+	glEnableVertexAttribArray(AL_POSITION);
+	renderer_check_glerror("sprite_batch_create:glEnableVertexAttribPointer");
+
+	// Uvs
+	glVertexAttribPointer(AL_UV, 2, GL_FLOAT, GL_FALSE, sizeof(struct Vertex), sizeof(vec3));
+	renderer_check_glerror("sprite_batch_create:glVertexAttribPointer");
+	glEnableVertexAttribArray(AL_UV);
+	renderer_check_glerror("sprite_batch_create:glEnableVertexAttribPointer");
+
+	// Color
+	glVertexAttribPointer(AL_COLOR, 4, GL_FLOAT, GL_FALSE, sizeof(struct Vertex), sizeof(vec3) + sizeof(vec2));
+	renderer_check_glerror("sprite_batch_create:glVertexAttribPointer");
+	glEnableVertexAttribArray(AL_COLOR);
+	renderer_check_glerror("sprite_batch_create:glEnableVertexAttribPointer");
+
+	//glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+
+	int texture = texture_create_from_file(texture_name, TU_DIFFUSE);
+	if(texture < 0)
+	{
+		log_error("sprite_batch:create", "Failed to find texture '%s' when creating sprite batch", texture_name);
+		texture = texture_create_from_file("default.tga", TU_DIFFUSE);
+	}
+	batch->texture = texture;
+
+	int shader = shader_create(vert_shader, frag_shader);
+	if(shader < -1)
+	{
+		log_error("sprite_batch:create", "Failed to create shader from '%s'/'%s' sprite batch", vert_shader, frag_shader);
+		shader = shader_create("default.vert", "default.frag");
+	}
+	batch->shader = shader;
+	batch->draw_mode = draw_mode;
+}
+
+void sprite_batch_begin(struct Sprite_Batch* batch)
+{
+	assert(batch);
+	batch->current_sprite_count = 0;
+}
+
+void sprite_batch_add_sprite(struct Sprite_Batch* batch, struct Sprite* sprite)
+{
+	assert(batch);
+	if(batch->current_sprite_count < SPRITE_BATCH_SIZE)
+	{
+		batch->current_sprite_count++;
+		memcpy(&batch->sprites[batch->current_sprite_count - 1], sprite, sizeof(struct Sprite));
+	}
+	else
+	{
+		log_error("sprite_batch:add_sprite", "Batch full");
+	}
+}
+
+void sprite_batch_add_sprite_new(struct Sprite_Batch* batch, int texture, struct Vertex vertices[MAX_SPRITE_VERTICES])
+{
+	assert(batch);
+	if(batch->current_sprite_count < SPRITE_BATCH_SIZE)
+	{
+		batch->current_sprite_count++;
+		memcpy(&batch->sprites[batch->current_sprite_count - 1], &vertices[0], sizeof(struct Sprite));
+	}
+	else
+	{
+		log_error("sprite_batch:add_sprite", "Batch full");
+	}
+}
+
+void sprite_batch_end(struct Sprite_Batch* batch)
+{
+	assert(batch);
+	glBindBuffer(GL_ARRAY_BUFFER, batch->vbo);
+	glBufferSubData(GL_ARRAY_BUFFER,
+					0,
+					sizeof(struct Vertex) * MAX_SPRITE_VERTICES * batch->current_sprite_count,
+		            &batch->sprites[0]);
+	renderer_check_glerror("sprite_batch_end:glBufferSubData");
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+void sprite_batch_render(struct Sprite_Batch* batch)
+{
+	assert(batch);
+	
+	texture_bind(batch->texture);
+	glBindVertexArray(batch->vao);
+	
+	glDrawArrays(batch->draw_mode, 0, MAX_SPRITE_VERTICES * batch->current_sprite_count);
+	renderer_check_glerror("sprite_batch_render:glDrawArrays");
+
+	glBindVertexArray(0);
+	texture_unbind(batch->texture);
+}

src/libsymmetry/sprite.h

@@ -0,0 +1,43 @@
+#ifndef SPRITE_H
+#define SPRITE_H
+
+#include "../common/linmath.h"
+#include "../common/num_types.h"
+
+#define SPRITE_BATCH_SIZE 1024
+#define MAX_SPRITE_VERTICES 6
+
+struct Vertex
+{
+	vec3 pos;
+	vec2 uv;
+	vec4 color;
+};
+
+struct Sprite
+{
+	struct Vertex vertices[MAX_SPRITE_VERTICES];
+};
+
+struct Sprite_Batch
+{
+	int           texture;
+	int           shader;
+	struct Sprite sprites[SPRITE_BATCH_SIZE];
+	int           draw_mode;
+	uint          vao;
+	uint          vbo;
+	int           current_sprite_count;
+};
+
+void sprite_init(void);
+void sprite_cleanup(void);
+
+void sprite_batch_create(struct Sprite_Batch* batch, const char* texture_name, const char* vert_shader, const char* frag_shader, int draw_mode);
+void sprite_batch_begin(struct Sprite_Batch* batch);
+void sprite_batch_add_sprite(struct Sprite_Batch* batch, struct Sprite* sprite);
+void sprite_batch_add_sprite_new(struct Sprite_Batch* batch, int texture, struct Vertex vertices[MAX_SPRITE_VERTICES]);
+void sprite_batch_end(struct Sprite_Batch* batch);
+void sprite_batch_render(struct Sprite_Batch* batch);
+
+#endif