renderer_opengl: Use textures for fragment shader LUTs instead of UBOs.

- Gets us LUT interpolation for free.
- Some older Intel GPU drivers did not support the big UBOs needed to store the LUTs.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp
index a82372995..ab4b6c7b1 100644
--- a/src/video_core/renderer_opengl/gl_state.cpp
+++ b/src/video_core/renderer_opengl/gl_state.cpp
@@ -170,6 +170,14 @@ void OpenGLState::Apply() {
         }
     }
 
+    // Lighting LUTs
+    for (unsigned i = 0; i < ARRAY_SIZE(lighting_lut); ++i) {
+        if (lighting_lut[i].texture_1d != cur_state.lighting_lut[i].texture_1d) {
+            glActiveTexture(GL_TEXTURE3 + i);
+            glBindTexture(GL_TEXTURE_1D, lighting_lut[i].texture_1d);
+        }
+    }
+
     // Framebuffer
     if (draw.framebuffer != cur_state.draw.framebuffer) {
         glBindFramebuffer(GL_FRAMEBUFFER, draw.framebuffer);