uterm: drm: fix y-invert bug

This fixes the last OpenGL user that still uses the wrong y-axis
direction. See the gltex helpers for more information.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

diff --git a/src/uterm_video_drm.c b/src/uterm_video_drm.c
index ef9586c..4790f6c 100644 (file)
--- a/src/uterm_video_drm.c
+++ b/src/uterm_video_drm.c
@@ -582,18 +582,18 @@ static int display_blit(struct uterm_display *disp,
        vertices[11] = -1.0;
 
        texpos[0] = 0.0;
-       texpos[1] = 0.0;
+       texpos[1] = 1.0;
        texpos[2] = 0.0;
-       texpos[3] = 1.0;
+       texpos[3] = 0.0;
        texpos[4] = 1.0;
-       texpos[5] = 1.0;
+       texpos[5] = 0.0;
 
        texpos[6] = 0.0;
-       texpos[7] = 0.0;
+       texpos[7] = 1.0;
        texpos[8] = 1.0;
-       texpos[9] = 1.0;
+       texpos[9] = 0.0;
        texpos[10] = 1.0;
-       texpos[11] = 0.0;
+       texpos[11] = 1.0;
 
        tmp = x + buf->width;
        if (tmp < x || x >= sw)
@@ -611,7 +611,7 @@ static int display_blit(struct uterm_display *disp,
        else
                height = buf->height;
 
-       glViewport(x, y, width, height);
+       glViewport(x, sh - y - height, width, height);
        glDisable(GL_BLEND);
 
        gl_shader_use(v3d->blit_shader);