GLSL Shaders -> Files (instead of #define)

[ipdf/code.git] / src / shaders / rect_vert.glsl

diff --git a/src/shaders/rect_vert.glsl b/src/shaders/rect_vert.glsl
new file mode 100644 (file)
index 0000000..cc15e56
--- /dev/null
+++ b/src/shaders/rect_vert.glsl
@@ -0,0 +1,25 @@
+#version 140
+#extension GL_ARB_shading_language_420pack : require
+#extension GL_ARB_explicit_attrib_location : require
+
+layout(std140, binding=0) uniform ViewBounds
+{
+       float bounds_x;
+       float bounds_y;
+       float bounds_w;
+       float bounds_h;
+};
+
+layout(location = 0) in vec2 position;
+
+void main()
+{
+       vec2 transformed_position;
+       transformed_position.x = (position.x - bounds_x) / bounds_w;
+       transformed_position.y = (position.y - bounds_y) / bounds_h;
+       // Transform to clip coordinates (-1,1, -1,1).
+       gl_Position.x = (transformed_position.x*2) - 1;
+       gl_Position.y = 1 - (transformed_position.y*2);
+       gl_Position.z = 0.0;
+       gl_Position.w = 1.0;
+}