OpenGL: add simple shaders for 2D drawing

The first two of several new simple built-in shaders (will test these
before adding more). These are intended for the new immediate mode API,
but you can use them just like any built-in GPUShader.

Due to limitations on different platforms, shaders need to work with
GLSL versions 120, 130 and 150. Final Blender 2.8 will be pure #version
150.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl b/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl
new file mode 100644
index 00000000000..e74485bfa4f
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_2D_smooth_color_vert.glsl
@@ -0,0 +1,18 @@
+
+#if __VERSION__ == 120
+  attribute vec2 pos;
+  attribute vec4 color;
+
+  varying vec4 finalColor;
+#else
+  in vec2 pos;
+  in vec4 color;
+
+  noperspective out vec4 finalColor;
+#endif
+
+void main()
+{
+	gl_Position = gl_ModelViewMatrix * vec4(pos, 0.0, 1.0);
+	finalColor = color;
+}