OpenGL: tweak image shaders & code that uses them

- rename image shaders to describe exactly what they do
- rename inputs to match other built-in shaders
- set & use active texture unit
- no need to enable/disable textures with GLSL
- pull vertex format setup out of loops

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_3D_image_vert.glsl b/source/blender/gpu/shaders/gpu_shader_3D_image_vert.glsl
new file mode 100644
index 00000000000..e9f847f28b3
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_3D_image_vert.glsl
@@ -0,0 +1,18 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+
+#if __VERSION__ == 120
+  attribute vec2 texCoord;
+  attribute vec3 pos;
+  varying vec2 texCoord_interp;
+#else
+  in vec2 texCoord;
+  in vec3 pos;
+  out vec2 texCoord_interp;
+#endif
+
+void main()
+{
+	gl_Position = ModelViewProjectionMatrix * vec4(pos.xyz, 1.0f);
+	texCoord_interp = texCoord;
+}