diff options
Diffstat (limited to 'slideshow/opengl/vortexVertexShader.glsl')
| -rw-r--r-- | slideshow/opengl/vortexVertexShader.glsl | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/slideshow/opengl/vortexVertexShader.glsl b/slideshow/opengl/vortexVertexShader.glsl index 3d5838e5b9b3..5c6fe23a3f15 100644 --- a/slideshow/opengl/vortexVertexShader.glsl +++ b/slideshow/opengl/vortexVertexShader.glsl @@ -26,6 +26,9 @@ uniform ivec2 numTiles; uniform sampler2D permTexture; uniform float slide; +// Workaround for Intel's Windows driver, to prevent optimisation breakage. +uniform float zero; + out vec2 g_texturePosition; out vec3 g_normal; out mat4 modelViewMatrix; @@ -130,10 +133,14 @@ void main( void ) vec3 translationVector = vec3(rotationFuzz, 0.0, 0.0); // Compute the actual rotation matrix. - transform = translationMatrix(translationVector) - * rotationMatrix(vec3(0.0, 1.0, 0.0), clamp(rotation, -1.0, 1.0) * M_PI) - * translationMatrix(-translationVector) - * transform; + + // Intel's Windows driver gives a wrong matrix when all operations are done at once. + if (zero < 1.0) + transform = translationMatrix(translationVector) * transform; + if (zero < 2.0) + transform = rotationMatrix(vec3(0.0, 1.0, 0.0), clamp(rotation, -1.0, 1.0) * M_PI) * transform; + if (zero < 3.0) + transform = translationMatrix(-translationVector) * transform; } modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix; |