remove ShaderArray struct, and add shaders to GLContext

src/main.cpp

@@ -114,19 +114,6 @@ getFreeGLMesh(gl_mesh_array* gma)
 	return nullptr;
 }
 
-ShaderArray*
-initShaderArray(memory_arena* arena, u32 count)
-{
-	ShaderArray* arr =
-		(ShaderArray*) arenaAllocateBlock(arena, sizeof(ShaderArray));
-	arr->max = count;
-	arr->count = 0;
-	arr->shaders = (shader_program*) arenaAllocateBlock(
-		arena, count * sizeof(shader_program));
-
-	return arr;
-}
-
 gl_mesh_array*
 initGLMeshArray(memory_arena* arena, u32 count)
 {
@@ -140,21 +127,23 @@ initGLMeshArray(memory_arena* arena, u32 count)
 	return gma;
 }
 
+#define DEFAULT_SHADER_COUNT 64
+#define DEFAULT_UBO_COUNT 32
 GLContext*
 initGLContext(memory_arena* arena)
 {
 	GLContext* gl_ctx =
 		(GLContext*) arenaAllocateBlock(arena, sizeof(GLContext));
-	gl_ctx->shader_arr = initShaderArray(arena, 256);
+	gl_ctx->max_shaders = DEFAULT_SHADER_COUNT;
+	gl_ctx->num_shaders = 0;
+	gl_ctx->shaders = (shader_program*) arenaAllocateBlock(
+		arena, DEFAULT_SHADER_COUNT * sizeof(shader_program));
+	gl_ctx->max_ubos = DEFAULT_UBO_COUNT;
+	gl_ctx->num_ubos = 0;
+	gl_ctx->uniform_buffers = (gl_buffer*) arenaAllocateBlock(arena,
+		gl_ctx->max_ubos * sizeof(gl_buffer));
 	gl_ctx->binding_count = 0;
 
-	// FIXME: why does only binding points work here?
-	// 	the other values were accessable after linking a shader maybe?
-	glGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS, &gl_ctx->max_binding_points);
-	glGetIntegerv(GL_MAX_VERTEX_UNIFORM_BLOCKS, &gl_ctx->max_vertex_blocks);
-	glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_BLOCKS, &gl_ctx->max_fragment_blocks);
-	glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &gl_ctx->max_ublock_size);
-
 	return gl_ctx;
 }
 
@@ -343,7 +332,10 @@ main()
 		return 1;
 
 	if (rs) {
-		rs->gl_ctx->xform_ubo = initTransforms(rs->xforms, rs->gl_ctx);
+
+		// FIXME: need to test this with another shader that has another UBO
+		gl_buffer& ubo = rs->gl_ctx->uniform_buffers[rs->gl_ctx->num_ubos++];
+		initTransforms(arena, rs->xforms, &ubo, rs->gl_ctx);
 
 		if (!addShaderProgram(arena,
 				rs->gl_ctx,

src/shader.cpp

@@ -32,13 +32,13 @@ addShaderProgram(memory_arena* arena,
 	const char* fs,
 	const char* name)
 {
-	if (gl_ctx->shader_arr->count >= gl_ctx->shader_arr->max) {
-		std::cout << "ShaderArray full\n";
+	if (gl_ctx->num_shaders >= gl_ctx->max_shaders) {
+		printf("%s(), GLContext->shaders full\n", __FUNCTION__);
 		return false;
 	}
 
-	shader_program* s = &gl_ctx->shader_arr->shaders[gl_ctx->shader_arr->count];
-	gl_ctx->shader_arr->count++;
+	shader_program* s = &gl_ctx->shaders[gl_ctx->num_shaders];
+	gl_ctx->num_shaders++;
 
 	u32 name_len = std::strlen(name) + 1;
 	s->name = (char*) arenaAllocateBlock(arena, name_len);
@@ -73,6 +73,10 @@ addShaderProgram(memory_arena* arena,
 		glGetProgramiv(s->prog_id, GL_LINK_STATUS, &is_linked);
 
 		if (is_linked) {
+			// NOTE: need to set context maximums after at least one shader has
+			// 	been linked
+			initCTXSizes(gl_ctx);
+			dumpShader(s->prog_id);
 			s->model_xform_id = glGetUniformLocation(s->prog_id, "model_xform");
 
 			// FIXME: testing
@@ -195,8 +199,19 @@ parseShaderUniforms(memory_arena* arena, shader_program* s, GLContext* gl_ctx)
 	}
 }
 
-gl_buffer
-initTransforms(transforms* xforms,
+bool
+parseAttributes(memory_arena* arena, shader_program* s, GLContext* gl_ctx)
+{
+	// TODO: parse buffers (vert, normal, uv), glGetActiveAttrib()
+	///
+	printf("%s(), FIXME:\n", __FUNCTION__);
+	return true;
+}
+
+void
+initTransforms(memory_arena* arena,
+	transforms* xforms,
+	gl_buffer* xform_ubo,
 	GLContext* gl_ctx,
 	float fov,
 	float near_clip_plane,
@@ -208,22 +223,51 @@ initTransforms(transforms* xforms,
 	xforms->proj_xform = glm::infinitePerspective(
 		glm::radians(fov), aspect_ratio, near_clip_plane);
 
-	gl_buffer ubo = {0};
-	glGenBuffers(1, &ubo.id);
-	ubo.target = GL_UNIFORM_BUFFER;
-	ubo.data_type = GL_FLOAT;
-	ubo.data_size = sizeof(*xforms);
-	glBindBuffer(GL_UNIFORM_BUFFER, ubo.id);
-	glBufferData(GL_UNIFORM_BUFFER, sizeof(*xforms), xforms, GL_DYNAMIC_DRAW);
-
-	// NOTE: need to manually keep track of block bindings
-	glGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS, &gl_ctx->max_binding_points);
-	glBindBufferBase(GL_UNIFORM_BUFFER, gl_ctx->binding_count, ubo.id);
-	ubo.binding_idx = gl_ctx->binding_count;
-	gl_ctx->binding_count++;
-	glBindBuffer(GL_UNIFORM_BUFFER, 0);
-
-	return ubo;
+	glGenBuffers(1, &xform_ubo->id);
+	xform_ubo->target = GL_UNIFORM_BUFFER;
+	xform_ubo->data_type = GL_FLOAT;
+	xform_ubo->data_size = sizeof(*xforms);
+
+	// TODO: make an arenaAddCStr(arena, char*& str_ref) for this nonsense
+	const char* block_name = "matrices";
+	u32 name_len = std::strlen(block_name) + 1;
+	xform_ubo->name = (char*) arenaAllocateBlock(arena, name_len);
+	std::strncpy(xform_ubo->name, block_name, name_len);
+	// END TODO:
+
+	glBindBuffer(xform_ubo->target, xform_ubo->id);
+	glBufferData(xform_ubo->target, sizeof(*xforms), xforms,
+		GL_DYNAMIC_DRAW);
+	// bindbufferbase
+	xform_ubo->binding_idx = gl_ctx->binding_count++;
+	glBindBufferBase(xform_ubo->target, xform_ubo->binding_idx, xform_ubo->id);
+	glBindBuffer(xform_ubo->target, 0);
+}
+
+void
+initCTXSizes(GLContext* gl_ctx)
+{
+	// NOTE: see https://docs.gl/gl3/glGet for other useful context info
+	if (gl_ctx->max_binding_points == 0) {
+		glGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS,
+				&gl_ctx->max_binding_points);
+		glGetIntegerv(GL_MAX_VERTEX_UNIFORM_BLOCKS, &gl_ctx->max_vertex_blocks);
+		glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_BLOCKS,
+				&gl_ctx->max_fragment_blocks);
+		glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &gl_ctx->max_ublock_size);
+
+#if 1
+		printf("%s(), context size info set\n", __FUNCTION__);
+		printf("GL_MAX_UNIFORM_BUFFER_BINDINGS: %d\n",
+				gl_ctx->max_binding_points);
+		printf("GL_MAX_VERTEX_UNIFORM_BLOCKS: %d\n",
+				gl_ctx->max_vertex_blocks);
+		printf("GL_MAX_FRAGMENT_UNIFORM_BLOCKS: %d\n",
+				gl_ctx->max_fragment_blocks);
+		printf("GL_MAX_UNIFORM_BLOCK_SIZE: %d\n",
+				gl_ctx->max_ublock_size);
+#endif
+	}
 }
 
 gl_mesh

src/shader.h

@@ -61,26 +61,21 @@ struct shader_program
 	u64 hash; // NOTE: hash of vs filpath + fs filepath concat
 };
 
-// TODO: is it a good idea to merge this into GLContext?
-struct ShaderArray
-{
-	u32 count;
-	u32 max;
-	shader_program* shaders;
-};
-
 struct GLContext
 {
-	gl_buffer xform_ubo;
-	// TODO: keep an array of uniform buffer objects stored on ctx?
-
 	GLuint binding_count;
 	GLint max_binding_points;
 	GLint max_vertex_blocks;
 	GLint max_fragment_blocks;
 	GLint max_ublock_size;
 
-	ShaderArray* shader_arr;
+	u32 max_ubos;
+	u32 num_ubos;
+	gl_buffer* uniform_buffers;
+
+	u32 max_shaders;
+	u32 num_shaders;
+	shader_program* shaders;
 };
 
 struct transforms
@@ -150,7 +145,9 @@ gl_mesh loadGLMesh(shader_program* s,
 	const mesh& m,
 	GLenum draw_mode,
 	const glm::vec3& pos);
-gl_buffer initTransforms(transforms* xforms,
+void initTransforms(memory_arena* arena,
+	transforms* xforms,
+	gl_buffer* xform_ubo,
 	GLContext* gl_ctx,
 	float fov = DEFAULT_FOV,
 	float near_clip_plane = NEAR_CLIP_PLANE,