From 0e0c5aa9039d6aab9732392d439e1932eaae84e9 Mon Sep 17 00:00:00 2001
From: cinnaboot <cinnaboot@protonmail.com>
Date: Sat, 18 Dec 2021 11:12:13 -0500
Subject: [PATCH] add more debug info for vertex attribs

---
 src/shader.cpp | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/shader.cpp b/src/shader.cpp
index ac41a26..b84233b 100644
--- a/src/shader.cpp
+++ b/src/shader.cpp
@@ -375,6 +375,10 @@ initCTXSizes(GLContext* gl_ctx)
 				gl_ctx->max_fragment_blocks);
 		printf("GL_MAX_UNIFORM_BLOCK_SIZE: %d\n",
 				gl_ctx->max_ublock_size);
+
+		GLint max_vertex_attribs = 0;
+		glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &max_vertex_attribs);
+		printf("GL_MAX_VERTEX_ATTRIBS: %d\n", max_vertex_attribs);
 #endif
 	}
 }
@@ -441,7 +445,35 @@ parseAttributes(memory_arena* arena, shader_program* s, GLContext* gl_ctx)
 {
 	// TODO: parse buffers (vert, normal, uv), glGetActiveAttrib()
 	///
-	printf("%s(), FIXME:\n", __FUNCTION__);
+	printf("\n---------------------------------\n");
+	printf("%s(), FIXME: dumping attrib info for programe: %s\n",
+			__FUNCTION__, s->name);
+
+
+	GLint active_attribs;
+	glGetProgramiv(s->prog_id, GL_ACTIVE_ATTRIBUTES, &active_attribs);
+	printf("active attributes: %d\n", active_attribs);
+
+	GLchar attrib_name[256];
+	GLsizei length;
+	GLint size;
+	GLenum type;
+
+	for (int i = 0; i < active_attribs; i++) {
+		glGetActiveAttrib(s->prog_id, i, sizeof(attrib_name),
+							&length, &size, &type, attrib_name);
+		GLint location = glGetAttribLocation(s->prog_id, attrib_name);
+		printf("attrib idx: %d, location: %d, type: %s, name: %s \n",
+				i, location, glEnumToString(type), attrib_name);
+
+		// TODO: create a gl_buffer for each vertex attrib...
+		// TODO: store attrib location on attrib struct
+		// TODO: replace POSITION, NORMAL, UV... etc enums in loadGLMesh()
+		// 	with extra logic to detect mesh to shader mapping
+	}
+
+	printf("---------------------------------\n\n");
+
 	return true;
 }