remove fixed properties of ShaderProgram in favor of dynamic properties

this makes use of our dynamic shader parsing code, so we don't need to
track these properties explicitly any more.

src/shader.cpp

@@ -102,9 +102,6 @@ addShaderProgram(MemoryArena* arena,
 		GLuint vs_id, fs_id;
 
 		if (compileAndLinkShader(s, v_str, f_str, vs_id, fs_id)) {
-			s->node_xform_id = glGetUniformLocation(s->prog_id, "node_xform");
-			// TODO: add sampler uniform detection in dynamic shader parsing
-			s->sampler_id = glGetUniformLocation(s->prog_id, "sampler");
 			glDetachShader(s->prog_id, vs_id);
 			glDetachShader(s->prog_id, fs_id);
 			glDeleteShader(vs_id);
@@ -239,12 +236,21 @@ renderVAO(GLMesh* glmesh,
 {
 	glUseProgram(shader->prog_id);
 	glBindVertexArray(glmesh->vao_id);
-	glUniformMatrix4fv(shader->node_xform_id, 1, GL_FALSE,
-		(float*) node_xform);
 
-	if (glmesh->has_texture) {
-		glBindTexture(GL_TEXTURE_2D, gl_tex->id);
-		glUniform1i(shader->sampler_id, 0);
+	for (u32 i = 0; i < shader->num_uniforms; i++) {
+		const GLUniform& uniform = shader->uniforms[i];
+
+		if (uniform.uniform_type == UNIFORM_NODE_XFORM) {
+			glUniformMatrix4fv(uniform.location, 1, GL_FALSE,
+								(float*) node_xform);
+		}
+
+		else if (glmesh->has_texture &&
+				uniform.uniform_type == UNIFORM_SAMPLER)
+		{
+			glBindTexture(GL_TEXTURE_2D, gl_tex->id);
+			glUniform1i(uniform.location, 0);
+		}
 	}
 
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, glmesh->element_buf->id);
@@ -519,6 +525,27 @@ getGLTypeSizeStd140(GLenum e)
 	}
 }
 
+UniformType
+getUniformType(const char* name)
+{
+	if (utilCStrMatch(name, "sampler"))
+		return UNIFORM_SAMPLER;
+	else if (utilCStrMatch(name, "node_xform"))
+		return UNIFORM_NODE_XFORM;
+	else if (utilCStrMatch(name, "normal_xform"))
+		return UNIFORM_NORMAL_XFORM;
+	else if (utilCStrMatch(name, "view_xform"))
+		return UNIFORM_VIEW_XFORM;
+	else if (utilCStrMatch(name, "proj_xform"))
+		return UNIFORM_PROJECTION_XFORM;
+	else if (utilCStrMatch(name, "matrices"))
+		return UNIFORM_BLOCK_XFORMS;
+	else if (utilCStrMatch(name, "lights"))
+		return UNIFORM_BLOCK_LIGHTS;
+	else
+		return UNIFORM_UNKNOWN;
+}
+
 const GLUniform
 parseUniform(MemoryArena* arena, ShaderProgram* s, u32 uniform_idx)
 {
@@ -532,7 +559,7 @@ parseUniform(MemoryArena* arena, ShaderProgram* s, u32 uniform_idx)
 		sizeof(unif_name),
 		&name_len,
 		&unif.num_elements,
-		&unif.uniform_type,
+		&unif.gl_type,
 		unif_name);
 
 	glGetActiveUniformsiv(s->prog_id, 1, &uniform_idx, GL_UNIFORM_BLOCK_INDEX,
@@ -543,6 +570,7 @@ parseUniform(MemoryArena* arena, ShaderProgram* s, u32 uniform_idx)
 							&unif.uniform_offset);
 
 	unif.name = arenaCopyCStr(arena, unif_name);
+	unif.uniform_type = getUniformType(unif.name);
 	unif.location = glGetUniformLocation(s->prog_id, unif.name);
 
 	return unif;
@@ -635,6 +663,7 @@ parseUniformBlocks(MemoryArena* arena, ShaderProgram* s, GLContext* gl_ctx)
 		glGetActiveUniformBlockName(
 				s->prog_id, i, 256, &name_len, block_name);
 		ub.name = arenaCopyCStr(arena, block_name);
+		ub.uniform_type = getUniformType(ub.name);
 
 		glGetActiveUniformBlockiv(s->prog_id, i,
 				GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, (GLint*) &ub.num_uniforms);

src/shader.h

@@ -9,6 +9,19 @@
 #include "util.h"
 
 
+enum UniformType
+{
+	UNIFORM_SAMPLER,
+	UNIFORM_NODE_XFORM,
+	UNIFORM_VIEW_XFORM,
+	UNIFORM_PROJECTION_XFORM,
+	UNIFORM_NORMAL_XFORM,
+	UNIFORM_BLOCK_XFORMS,
+	UNIFORM_BLOCK_LIGHTS,
+	UNIFORM_UNKNOWN,
+	UNIFORM_TYPE_COUNT
+};
+
 struct GLUniform
 {
 	// NOTE: would be nice to use idx as the location parameter because it seems
@@ -17,7 +30,8 @@ struct GLUniform
 	GLuint idx;
 	GLint location;
 	GLint block_idx;
-	GLenum uniform_type; // NOTE: GL_UNSIGNED_INT, GL_FLOAT_VEC4
+	UniformType uniform_type;
+	GLenum gl_type; // NOTE: GL_UNSIGNED_INT, GL_FLOAT_VEC4
 	GLint num_elements; // NOTE: 1 unless uniform is an array of base types
 	GLint array_stride; // NOTE: bytes between array elements
 	GLint uniform_offset; // NOTE: byte offset from beginning of uniform
@@ -28,6 +42,7 @@ struct GLUniformBlock
 {
 	GLuint block_id;
 	GLint binding_idx;
+	UniformType uniform_type;
 	GLuint num_uniforms;
 	GLUniform* uniforms;
 	char* name;
@@ -65,9 +80,6 @@ struct GLBufferToAttribMapping
 struct ShaderProgram
 {
 	GLuint prog_id;
-	GLuint xforms_ubo_id;
-	GLuint node_xform_id;
-	GLint sampler_id;
 
 	u32 num_blocks;
 	GLUniformBlock* uniform_blocks;

src/tangerine.h

@@ -58,6 +58,7 @@
 *  		- need a separate GLBufferToAttribMapping for each mesh on an entity
 *  		- maybe fixed now with MeshBufferType enum and getMeshData()
 *  - allow entities to have an empty diffuse texture (see initEntity())
+*  - use dynamic shader parsing to set 'sampler_id' for shaders with textures
 */