diff options
Diffstat (limited to 'cogl/cogl-matrix-stack.c')
| -rw-r--r-- | cogl/cogl-matrix-stack.c | 36 |
1 files changed, 26 insertions, 10 deletions
diff --git a/cogl/cogl-matrix-stack.c b/cogl/cogl-matrix-stack.c index b1f21c94..4e2269db 100644 --- a/cogl/cogl-matrix-stack.c +++ b/cogl/cogl-matrix-stack.c @@ -22,6 +22,7 @@ * * Authors: * Havoc Pennington <hp@pobox.com> for litl + * Robert Bragg <robert@linux.intel.com> */ #ifdef HAVE_CONFIG_H @@ -32,6 +33,7 @@ #include "cogl-context.h" #include "cogl-internal.h" #include "cogl-matrix-stack.h" +#include "cogl-draw-buffer-private.h" typedef struct { CoglMatrix matrix; @@ -412,21 +414,35 @@ _cogl_matrix_stack_flush_to_gl (CoglMatrixStack *stack, ctx->flushed_matrix_mode = mode; } - /* In theory it might help the GL implementation if we used our - * local analysis of the matrix and called Translate/Scale rather - * than LoadMatrix to send a 2D matrix + /* Because Cogl defines texture coordinates to have a top left origin and + * because offscreen draw buffers may be used for rendering to textures we + * always render upside down to offscreen buffers. */ - - if (state->is_identity) + if (mode == COGL_MATRIX_PROJECTION && + cogl_is_offscreen (_cogl_get_draw_buffer ())) { - if (!stack->flushed_identity) - GE (glLoadIdentity ()); - stack->flushed_identity = TRUE; + CoglMatrix flipped_projection; + CoglMatrix *projection = + state->is_identity ? &ctx->identity_matrix : &state->matrix; + + cogl_matrix_multiply (&flipped_projection, + &ctx->y_flip_matrix, projection); + GE (glLoadMatrixf (cogl_matrix_get_array (&flipped_projection))); + stack->flushed_identity = FALSE; } else { - GE (glLoadMatrixf (cogl_matrix_get_array (&state->matrix))); - stack->flushed_identity = FALSE; + if (state->is_identity) + { + if (!stack->flushed_identity) + GE (glLoadIdentity ()); + stack->flushed_identity = TRUE; + } + else + { + GE (glLoadMatrixf (cogl_matrix_get_array (&state->matrix))); + stack->flushed_identity = FALSE; + } } stack->flushed_state = state; } |