Initial commit

assets/shaders/standard.frag.glsl

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+#version 330 core
+
+uniform sampler2D u_tex0;
+
+in  vec4 vColor; // Vertex color.
+in  vec2 vTexCoord; // Texture coordinate.
+out vec4 fragColor;
+
+void main() {
+	fragColor = vColor * texture2D(u_tex0, vTexCoord);
+}

assets/shaders/standard.vert.glsl

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+#version 330 core
+
+uniform mat4 u_MVP;
+
+layout(location = 0) in  vec3 in_pos;
+layout(location = 3) in  vec3 in_color;
+layout(location = 8) in  vec2 in_texcoord;
+
+out vec4 vColor;
+out vec2 vTexCoord;
+
+void main(void) {
+    
+    gl_Position = u_MVP * vec4(in_pos, 1.0);
+    
+	vColor = vec4(in_color, 1.0);
+    
+    // in_texcoord is defined with (0,0) at top-left (same as in_pos)
+    // however, sampling in OpenGL expects bottom-left. So we must flip Y.
+	vTexCoord = vec2(in_texcoord.x, 1.0 - in_texcoord.y);
+}

assets/shaders/text.frag.glsl

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+#version 330 core
+
+uniform sampler2D u_tex0;
+
+in  vec2 vTexCoords;    // Texture coordinates (normalized)
+in  vec4 vColor;        // Vertex color
+out vec4 fragColor;     // Output frag color.
+
+void main() {
+	// Sample texture red component as alpha value.
+	vec4 sampled = vec4(1.0f, 1.0, 1.0, texture(u_tex0, vTexCoords).r);
+	fragColor = vColor * sampled;
+}

assets/shaders/text.vert.glsl

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+#version 330 core
+
+uniform mat4 u_MVP;
+uniform sampler2D u_tex0;
+
+layout (location = 0) in vec2 in_pos;
+layout (location = 3) in vec3 in_color;
+layout (location = 8) in vec2 in_texCoords;
+
+out vec2 vTexCoords;
+out vec4 vColor;
+
+void main() {
+
+	gl_Position = u_MVP * vec4(in_pos, 0.0f, 1.0f);
+
+	// Texture coordinates are in pixels.
+	// Need to convert into UV space before passing to fragment shader.
+	vTexCoords = in_texCoords / textureSize(u_tex0, 0);
+	vColor = vec4(in_color, 1.0);
+}