Add textureTransform to QTextureMaterial

New property adds support for 3x3 matrix used to transform
texture coordinates. Setting the existing textureOffset property
will affect the new matrix. That matrix is now used in the shaders.

Change-Id: I82778b048093e7e291c079e9d333a04a84c925f0
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/extras/shaders/gl3/unlittexture.vert b/src/extras/shaders/gl3/unlittexture.vert
index 4aaa10a8f..7e245bd7f 100644
--- a/src/extras/shaders/gl3/unlittexture.vert
+++ b/src/extras/shaders/gl3/unlittexture.vert
@@ -8,11 +8,12 @@ out vec2 texCoord;
 
 uniform mat4 modelView;
 uniform mat4 mvp;
-uniform vec2 texCoordOffset;
+uniform mat3 texCoordTransform;
 
 void main()
 {
-    texCoord = vertexTexCoord + texCoordOffset;
+    vec3 tt = texCoordTransform * vec3(vertexTexCoord, 1.0);
+    texCoord = (tt / tt.z).xy;
     position = vec3( modelView * vec4( vertexPosition, 1.0 ) );
 
     gl_Position = mvp * vec4( vertexPosition, 1.0 );