add renAllocateGroup()

examples/assimp_loading/main.cpp

@@ -17,7 +17,7 @@ doFrameCallback(render_state* rs)
 }
 
 void
-doRenderLoop(render_state* rs, frame_callback_fn callback_fn, entity* entities, uint entity_count)
+doRenderLoop(render_state* rs, frame_callback_fn callback_fn)
 {
 	// TODO: move frame delay to renderFrame()
 	const uint TARGET_FPS = 60;
@@ -29,7 +29,8 @@ doRenderLoop(render_state* rs, frame_callback_fn callback_fn, entity* entities,
 	while (running) {
 		frameStart = SDL_GetTicks();
 
-		// TODO: add a better structure for input, and provide a callback to use here
+		// TODO: add a better structure for input, and provide a callback to use
+		// 	here
 		while (SDL_PollEvent(&e)) {
 			if ((e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE)
 				|| e.type == SDL_QUIT) {
@@ -39,13 +40,6 @@ doRenderLoop(render_state* rs, frame_callback_fn callback_fn, entity* entities,
 
 		callback_fn(rs);
 
-		// TODO: entity pointer and entity count should be stored somewhere on the render_state object
-		// TODO: render_group should track a group of entity objects. the entity objects
-		// 	should keep track of their own render_objects?
-		/*
-		*	render_group -> entities -> render_object(s)
-		*							 -> mesh_info ?
-		*/
 		renRenderFrame(rs);
 		SDL_GL_SwapWindow(rs->handles.window);
 		frameTime = SDL_GetTicks() - frameStart;
@@ -61,13 +55,15 @@ doRenderLoop(render_state* rs, frame_callback_fn callback_fn, entity* entities,
 int
 main()
 {
-	// TODO: would be nice to be able to pass in viewport_dims, window title here
+	// TODO: would be nice to be able to pass in viewport_dims, window title
+	// 	here
 	render_state* rs = renInit();
 	meInitAssimp();
 
-	// TODO: entInit() doesn't allocate memory because we want to do the allocation in
-	// 	one big block, but this is really clunky to use
-	entity spaceship;
+	// TODO: entInit() doesn't allocate memory because we want to do the
+	// 	allocation in one big block, but this is really clunky to use
+	render_group* group_1 = renAllocateGroup(1, *rs->default_shader);
+	entity spaceship = group_1->entities[0];
 
 	// TODO: this should be handled in entInit
 	entSetWorldPosition(spaceship, 0, 0, 0);
@@ -83,14 +79,14 @@ main()
 		glm::vec3(0,0,1)
 	);
 
-	// TODO: renderer::setDefaults() allocates 10 lights based on a MACRO in renderer.cpp
-	// 	probably need an interface to add more than that
-	// add a light
+	// TODO: renderer::setDefaults() allocates 10 lights based on a MACRO in
+	// 	renderer.cpp probably need an interface to add more than that add a
+	// 	light
 	rs->num_lights = 1;
 	rs->lights[0].position = glm::vec3(200, -150, 150);
 
-	// TODO: look into setting up git-annex for large files. git-lfs works fine for gitlab,
-	// 	but has no real implementation for self-hosting:
+	// TODO: look into setting up git-annex for large files. git-lfs works fine
+	// 	for gitlab, but has no real implementation for self-hosting:
 	// 		https://github.com/git-lfs/git-lfs/issues/1044
 	// 		https://git-annex.branchable.com/
 	//
@@ -98,7 +94,7 @@ main()
 	logDebugAnimationInfo("../data/spaceship.glb");
 
 	if (entInit(spaceship, "../data/spaceship.glb"))
-		doRenderLoop(rs, doFrameCallback, &spaceship, 1);
+		doRenderLoop(rs, doFrameCallback);
 	else
 		LOG(Error) << "Error initializing entity, exiting\n";
 

include/entity.h

@@ -32,6 +32,7 @@ bool entInit(entity& e, const char* model_path);
 
 void entFree(entity& e);
 
+// TODO: just use glm::vec3 here also
 void entSetWorldPosition(entity& e, float x, float y, float z);
 
 void entTranslate(entity& e, glm::vec3 v);

include/render_object.h

@@ -16,6 +16,7 @@ struct render_object
 	GLuint index_buffer_id;
 };
 
+// TODO: make use of glIsBuffer/glDeleteBuffers
 void roFree(render_object* ro);
 
 // TODO: implement me!

include/renderer.h

@@ -30,7 +30,6 @@ struct point_light
 	float intensity;
 };
 
-/*
 // NOTE: array of entities rendered with the same shader program
 struct render_group
 {
@@ -39,7 +38,6 @@ struct render_group
 
 	shader_program shader;
 };
-*/
 
 struct render_state
 {
@@ -49,8 +47,10 @@ struct render_state
 	camera cam;
 	util_RGBA clear_col;
 
-	//render_group* render_groups;
-	//uint render_group_count;
+	render_group** render_groups;
+	uint render_group_count;
+
+	shader_program* default_shader;
 
 	point_light* lights;
 	uint num_lights;
@@ -61,5 +61,8 @@ render_state* renInit();
 
 void renShutdown(render_state* rs);
 
+render_group*
+renAllocateGroup(uint entity_count, shader_program shader);
+
 void renRenderFrame(render_state* rs);
 

include/shader_program.h

@@ -20,3 +20,4 @@ struct shader_program
 
 shader_program* shaderInit(const char* vertex_code, const char* frag_code);
 
+// TODO: make use of glDeleteShader/glDeleteProgram in eg) shaderFree()

src/entity.cpp

@@ -5,19 +5,27 @@
 #include "entity.h"
 
 
+// forward declarations
+
+bool loadMeshIntoGL(entity& e);
 #if 0
 bool initEntityROs(entity& e);
 bool convertMeshInfo(meMeshInfo* mesh, render_object* ro, bool use_normals, bool use_texture);
 #endif
 
+
+// interface
+
 bool
 entInit(entity& e, const char* model_path)
 {
 	e.world_transform = glm::mat4(1.0);
 	entScale(e, glm::vec3(1.0));
-
-	if (meLoadFromFile(e.mesh_group, model_path)) {
 	entSetWorldPosition(e, 0, 0, 0);
+
+	if (meLoadFromFile(e.mesh_group, model_path)
+		&& loadMeshIntoGL(e))
+	{
 #if 0
 		initEntityRG(e, shader, e.mesh_group.use_normals);
 
@@ -64,6 +72,16 @@ entScale(entity& e, glm::vec3 v)
 	e.world_transform = glm::scale(e.world_transform, v);
 }
 
+
+// internal
+
+bool
+loadMeshIntoGL(entity& e)
+{
+	LOG(Error) << "TODO: redo GL init for new render_object\n";
+	return false;
+}
+
 #if 0
 void
 initEntityRG(entity& e, rg_shader_program& shader, bool use_normals)

src/renderer.cpp

@@ -48,13 +48,21 @@ renInit()
 		initContext(rs->handles) &&
 		initGlOptions())
 	{
+		rs->default_shader =
+			shaderInit(DEFAULT_VERTEX_SHADER, DEFAULT_FRAGMENT_SHADER);
+
+		if (rs->default_shader != nullptr) {
 			return rs;
 		} else {
-		LOG(Error) << "renderer initialization failed, aborting\n";
+			LOG(Error) << "shader loading failed\n";
 			return nullptr;
 		}
 	}
 
+	LOG(Error) << "renderer initialization failed, aborting\n";
+	return nullptr;
+}
+
 void
 renShutdown(render_state* rs)
 {
@@ -64,6 +72,16 @@ renShutdown(render_state* rs)
 	SDL_Quit();
 }
 
+render_group*
+renAllocateGroup(uint entity_count, shader_program shader)
+{
+	assert(entity_count > 0);
+	render_group* rg = UTIL_ALLOC(1, render_group);
+	rg->entities = UTIL_ALLOC(entity_count, entity);
+	rg->shader = shader;
+	return rg;
+}
+
 void
 renRenderFrame(render_state* rs)
 {