commit f701df87fdfba8a846867bf9fdd8c02ebfa2ef5f
author Sam Lantinga <slouken@libsdl.org> Sat Oct 01 11:40:57 2016 -0700
committer Sam Lantinga <slouken@libsdl.org> Sat Oct 01 11:40:57 2016 -0700
tree fc8f94de3654fbb3d2a40e30e4eeed2fd1ac6287
parent 6abdc4d69509090ea63fa874574b432b18debf8f

Fixed bug 3347 - OpenGL ES renderer doesn't flip projection matrix for target textures

Simon Hug

When updating the viewport in GLES_UpdateViewport, the OpenGL ES renderer doesn't flip the projection matrix for target textures. The lines, rectangles and textures (if drawn with glDrawArrays) are upside down when drawing to target textures.

src/render/opengles/SDL_render_gles.c

diff --git a/src/render/opengles/SDL_render_gles.c b/src/render/opengles/SDL_render_gles.c
index 9b72597..b8b8c1d 100644
--- a/src/render/opengles/SDL_render_gles.c
+++ b/src/render/opengles/SDL_render_gles.c
@@ -676,13 +676,22 @@
                          renderer->viewport.w, renderer->viewport.h);
     }
 
+    data->glMatrixMode(GL_PROJECTION);
+    data->glLoadIdentity();
     if (renderer->viewport.w && renderer->viewport.h) {
-        data->glMatrixMode(GL_PROJECTION);
-        data->glLoadIdentity();
-        data->glOrthof((GLfloat) 0,
-                 (GLfloat) renderer->viewport.w,
-                 (GLfloat) renderer->viewport.h,
-                 (GLfloat) 0, 0.0, 1.0);
+        if (renderer->target) {
+            data->glOrthof((GLfloat) 0,
+                           (GLfloat) renderer->viewport.w,
+                           (GLfloat) 0,
+                           (GLfloat) renderer->viewport.h,
+                           0.0, 1.0);
+        } else {
+            data->glOrthof((GLfloat) 0,
+                           (GLfloat) renderer->viewport.w,
+                           (GLfloat) renderer->viewport.h,
+                           (GLfloat) 0,
+                           0.0, 1.0);
+        }
     }
     return 0;
 }