From 50089bf9969edb5f10ff552b90620a4882e3c474 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 20 Feb 2021 13:38:38 +0000
Subject: m4 based GLSL embedding

Passes a lint check, less mangling, more automation
---
 gfx/gl/shader-source.h | 20 ++++++++++++++++++++
 gfx/gl/shader.cpp      | 34 ++++++++++++++--------------------
 gfx/gl/shader.h        |  6 +++---
 3 files changed, 37 insertions(+), 23 deletions(-)
 create mode 100644 gfx/gl/shader-source.h

(limited to 'gfx')

diff --git a/gfx/gl/shader-source.h b/gfx/gl/shader-source.h
new file mode 100644
index 0000000..4fbbe5b
--- /dev/null
+++ b/gfx/gl/shader-source.h
@@ -0,0 +1,20 @@
+#ifndef SHADER_SOURCE_H
+#define SHADER_SOURCE_H
+
+#include <GL/glew.h>
+
+struct GLsource {
+	const GLchar * text;
+	GLint len;
+	GLuint type;
+};
+
+constexpr auto
+constexpr_strlen(const GLchar * const s)
+{
+	auto e {s};
+	while (*++e) { }
+	return e - s;
+}
+
+#endif
diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp
index f80ab22..badaaef 100644
--- a/gfx/gl/shader.cpp
+++ b/gfx/gl/shader.cpp
@@ -10,11 +10,10 @@
 #include <stdexcept>
 #include <string>
 
-Shader::ProgramHandle::ProgramHandle(std::initializer_list<GLuint> srcs) : viewProjection_uniform {}, model_uniform {}
+Shader::ProgramHandle::ProgramHandle(GLuint vs, GLuint fs) : viewProjection_uniform {}, model_uniform {}
 {
-	for (const auto & srcId : srcs) {
-		glAttachShader(m_program, srcId);
-	}
+	glAttachShader(m_program, vs);
+	glAttachShader(m_program, fs);
 
 	glBindAttribLocation(m_program, 0, "position");
 	glBindAttribLocation(m_program, 1, "texCoord");
@@ -31,17 +30,17 @@ Shader::ProgramHandle::ProgramHandle(std::initializer_list<GLuint> srcs) : viewP
 }
 
 Shader::Shader() :
-	programs {{ProgramHandle {
-					   Source {{basicShader_vs, basicShader_vs_len}, GL_VERTEX_SHADER}.id,
-					   Source {{basicShader_fs, basicShader_fs_len}, GL_FRAGMENT_SHADER}.id,
+	programs {{{
+					   Source {basicShader_vs}.id,
+					   Source {basicShader_fs}.id,
 			   },
-			ProgramHandle {
-					Source {{waterShader_vs, waterShader_vs_len}, GL_VERTEX_SHADER}.id,
-					Source {{waterShader_fs, waterShader_fs_len}, GL_FRAGMENT_SHADER}.id,
+			{
+					Source {waterShader_vs}.id,
+					Source {waterShader_fs}.id,
 			},
-			ProgramHandle {
-					Source {{landmassShader_vs, landmassShader_vs_len}, GL_VERTEX_SHADER}.id,
-					Source {{landmassShader_fs, landmassShader_fs_len}, GL_FRAGMENT_SHADER}.id,
+			{
+					Source {landmassShader_vs}.id,
+					Source {landmassShader_fs}.id,
 			}}}
 {
 }
@@ -99,14 +98,9 @@ Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, std::string
 	}
 }
 
-Shader::Source::Source(const std::basic_string_view<unsigned char> text, GLuint type) :
-	Source {(const GLchar *)(text.data()), (GLint)(text.length()), type}
-{
-}
-
-Shader::Source::Source(const GLchar * text, GLint len, unsigned int type) : id {type}
+Shader::Source::Source(const GLsource src) : id {src.type}
 {
-	glShaderSource(id, 1, &text, &len);
+	glShaderSource(id, 1, &src.text, &src.len);
 	glCompileShader(id);
 
 	CheckShaderError(id, GL_COMPILE_STATUS, false, "Error compiling shader!");
diff --git a/gfx/gl/shader.h b/gfx/gl/shader.h
index 47a2b7d..293ce9b 100644
--- a/gfx/gl/shader.h
+++ b/gfx/gl/shader.h
@@ -1,6 +1,7 @@
 #ifndef SHADER_INCLUDED_H
 #define SHADER_INCLUDED_H
 
+#include "shader-source.h"
 #include <GL/glew.h>
 #include <array>
 #include <glRef.hpp>
@@ -22,8 +23,7 @@ private:
 	public:
 		using ShaderRef = glRef<GLuint, __glewCreateShader, __glewDeleteShader>;
 
-		Source(const std::basic_string_view<unsigned char> text, GLuint type);
-		Source(const GLchar * text, GLint len, GLuint type);
+		explicit Source(const GLsource src);
 
 		ShaderRef id;
 	};
@@ -32,7 +32,7 @@ private:
 
 	class ProgramHandle {
 	public:
-		explicit ProgramHandle(std::initializer_list<GLuint>);
+		ProgramHandle(GLuint, GLuint);
 		using ProgramRef = glRef<GLuint, __glewCreateProgram, __glewDeleteProgram>;
 
 		ProgramRef m_program;
-- 
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