From 65c12555b2999a0e327e04fc49d623de8c04bac6 Mon Sep 17 00:00:00 2001
From: cinnaboot <cinnaboot@protonmail.com>
Date: Fri, 31 Dec 2021 11:16:27 -0500
Subject: [PATCH] add GLTexture structure, and gl_ctx->textures

---
 src/main.cpp | 34 +++++++++++++++++-----------------
 src/shader.h | 13 +++++++++++++
 2 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index b63e2c6..939a2a2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -29,6 +29,7 @@ struct Entity
 {
 	u32 num_meshes;
 	GLmesh* meshes;
+	GLTexture* diffuse_texture;	// NOTE: pointer into gl_ctx->textures array
 	glm::mat4* xform;
 	char* name;
 };
@@ -156,23 +157,6 @@ getFreeRenderGroup(RenderState* rs)
 	return nullptr;
 }
 
-#define DEFAULT_SHADER_COUNT 64
-#define DEFAULT_UBO_COUNT 32
-GLContext*
-initGLContext(memory_arena* arena)
-{
-	GLContext* gl_ctx = ARENA_ALLOC(arena, GLContext, 1);
-	gl_ctx->max_shaders = DEFAULT_SHADER_COUNT;
-	gl_ctx->num_shaders = 0;
-	gl_ctx->shaders = ARENA_ALLOC(arena, shader_program, DEFAULT_SHADER_COUNT);
-	gl_ctx->max_ubos = DEFAULT_UBO_COUNT;
-	gl_ctx->num_ubos = 0;
-	gl_ctx->uniform_buffers = ARENA_ALLOC(arena, gl_buffer, gl_ctx->max_ubos);
-	gl_ctx->binding_count = 0;
-
-	return gl_ctx;
-}
-
 #define DEFAULT_MODEL_COUNT 256
 #define DEFAULT_TEXTURE_COUNT 64
 Assets*
@@ -188,6 +172,22 @@ initAssets(memory_arena* arena,
 	return assets;
 }
 
+#define DEFAULT_SHADER_COUNT 64
+#define DEFAULT_UBO_COUNT 32
+GLContext*
+initGLContext(memory_arena* arena)
+{
+	GLContext* gl_ctx = ARENA_ALLOC(arena, GLContext, 1);
+	gl_ctx->max_shaders = DEFAULT_SHADER_COUNT;
+	gl_ctx->shaders = ARENA_ALLOC(arena, shader_program, DEFAULT_SHADER_COUNT);
+	gl_ctx->max_ubos = DEFAULT_UBO_COUNT;
+	gl_ctx->uniform_buffers = ARENA_ALLOC(arena, gl_buffer, gl_ctx->max_ubos);
+	gl_ctx->max_textures = DEFAULT_TEXTURE_COUNT;
+	gl_ctx->textures = ARENA_ALLOC(arena, GLTexture, gl_ctx->max_textures);
+
+	return gl_ctx;
+}
+
 #define DEFAULT_RENDER_GROUP_COUNT 256
 RenderState*
 initRenderState()
diff --git a/src/shader.h b/src/shader.h
index e511ed4..f058ec9 100644
--- a/src/shader.h
+++ b/src/shader.h
@@ -72,6 +72,14 @@ struct gl_buffer
 	char* name;
 };
 
+struct GLTexture
+{
+	GLuint id;
+	GLenum pixel_format; // NOTE: GL_RGB or GL_RGBA
+	u32 width;
+	u32 height;
+};
+
 struct GLContext
 {
 	GLuint binding_count;
@@ -87,6 +95,10 @@ struct GLContext
 	u32 max_shaders;
 	u32 num_shaders;
 	shader_program* shaders;
+
+	u32 max_textures;
+	u32 num_textures;
+	GLTexture* textures;
 };
 
 struct GLBufferToAttribMapping
@@ -96,6 +108,7 @@ struct GLBufferToAttribMapping
 	void* mesh_buf;
 };
 
+// TODO: rename to GLMesh
 struct GLmesh
 {
 	u32 num_indices;