add builtin shaders

framework/opengl_renderer/src/mm/opengl/res/shaders_builtin.cpp

@@ -0,0 +1,90 @@
+#include "./shaders_builtin.hpp"
+
+#include <mm/fs_const_archiver.hpp>
+
+namespace MM::OpenGL {
+
+void load_builtin_shaders_fs(void) {
+
+	// ==================== sampling.glsl ==================== START
+	FS_CONST_MOUNT_FILE("/shaders/builtin/sampling.glsl",
+R"(
+#ifndef INCLUDE_BUILTIN_SAMPLING
+#define INCLUDE_BUILTIN_SAMPLING
+
+// kernel defined 9tap sampling
+// samper, uv, 1.0/textureSize(), kernel, sum of kernel
+vec3 sampling2D_kernel3x3_vec3(in sampler2D tex, in vec2 pos, in vec2 dir_step, in mat3x3 kernel, in float kernel_weight) {
+	vec3 color =
+		// upper row
+		texture(tex, pos + dir_step * vec2(-1.0, 1.0)).rgb * kernel[0][0]
+		+ texture(tex, pos + dir_step * vec2(0.0, 1.0)).rgb * kernel[0][1]
+		+ texture(tex, pos + dir_step * vec2(1.0, 1.0)).rgb * kernel[0][2]
+
+		// middle row
+		+ texture(tex, pos + dir_step * vec2(-1.0, 0.0)).rgb * kernel[1][0]
+		+ texture(tex, pos).rgb * kernel[1][1]
+		+ texture(tex, pos + dir_step * vec2(1.0, 0.0)).rgb * kernel[1][2]
+
+		// lower row
+		+ texture(tex, pos + dir_step * vec2(-1.0, -1.0)).rgb * kernel[2][0]
+		+ texture(tex, pos + dir_step * vec2(0.0, -1.0)).rgb * kernel[2][1]
+		+ texture(tex, pos + dir_step * vec2(1.0, -1.0)).rgb * kernel[2][2]
+	;
+
+	return color / vec3(kernel_weight);
+}
+
+// 3x3 9tap tent filter
+// 1 2 1
+// 2 4 2
+// 1 2 1
+vec3 sampling2D_tent3x3_vec3(in sampler2D tex, in vec2 pos, in vec2 dir_step) {
+	const mat3x3 tent_kernel = mat3x3(
+		vec3(1.0, 2.0, 1.0),
+		vec3(2.0, 4.0, 2.0),
+		vec3(1.0, 2.0, 1.0)
+	);
+	const float tent_kernel_weight = 16.0;
+
+	return sampling2D_kernel3x3_vec3(
+		tex,
+		pos,
+		dir_step,
+		tent_kernel,
+		tent_kernel_weight
+	);
+}
+
+#endif
+)")
+	// ==================== sampling.glsl ==================== END
+
+	// ==================== tonemapping.glsl ==================== START
+	FS_CONST_MOUNT_FILE("/shaders/builtin/tonemapping.glsl",
+R"(
+#ifndef INCLUDE_BUILTIN_TONEMAPPING
+#define INCLUDE_BUILTIN_TONEMAPPING
+
+// https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
+vec3 tonemapACESFilm(vec3 x) {
+	const float a = 2.51;
+	const float b = 0.03;
+	const float c = 2.43;
+	const float d = 0.59;
+	const float e = 0.14;
+
+	return clamp((x*(a*x+b))/(x*(c*x+d)+e), vec3(0.0), vec3(1.0));
+}
+
+vec3 tonemapReinhard(vec3 x) {
+	return x / (x + vec3(1.0));
+}
+
+#endif
+)")
+	// ==================== tonemapping.glsl ==================== END
+}
+
+} // MM::OpenGL
+

framework/opengl_renderer/src/mm/opengl/res/shaders_builtin.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+namespace MM::OpenGL {
+
+// loads glsl files into const fs at "/shaders/builtin/"
+// file list:
+// - sampling.glsl
+// - tonemapping.glsl
+void load_builtin_shaders_fs(void);
+
+} // MM::OpenGL
+

framework/opengl_renderer/src/mm/services/opengl_renderer.cpp

@@ -10,6 +10,7 @@
 #include <mm/opengl/texture_loader.hpp>
 #include "../opengl/res/default_texture.h" // data
 #include "../opengl/res/errig_texture.h" // data
+#include "../opengl/res/shaders_builtin.hpp" // data-ish
 
 #include <tracy/Tracy.hpp>
 #ifndef MM_OPENGL_3_GLES
@@ -111,7 +112,7 @@ bool OpenGLRenderer::enable(Engine& engine, std::vector<UpdateStrategies::TaskIn
 		return false;
 	}
 
-	{ // default texures
+	{ // default textures
 		auto& rm_t = MM::ResourceManager<MM::OpenGL::Texture>::ref();
 		if (!rm_t.contains("default"_hs)) {
 			if (!rm_t.load<MM::OpenGL::TextureLoaderConstBuffer>("default", default_png, default_png_len)) {
@@ -125,6 +126,10 @@ bool OpenGLRenderer::enable(Engine& engine, std::vector<UpdateStrategies::TaskIn
 		}
 	}
 
+	{ // builtin shaders
+		OpenGL::load_builtin_shaders_fs();
+	}
+
 	{ // add task
 		task_array.push_back(
 			UpdateStrategies::TaskInfo{"OpenGLRenderer::render"}