mesa: add new internal state var for window size

Actually, window width - 1, height - 1

1 files changed, 13 insertions, 0 deletions

diff --git a/src/mesa/shader/prog_statevars.c b/src/mesa/shader/prog_statevars.c
index f51d9e26512..aeb7cf6de20 100644
--- a/src/mesa/shader/prog_statevars.c
+++ b/src/mesa/shader/prog_statevars.c
@@ -506,6 +506,13 @@ _mesa_fetch_state(GLcontext *ctx, const gl_state_index state[],
             }
          }
          return;
+      case STATE_FB_SIZE:
+         value[0] = (GLfloat) (ctx->DrawBuffer->Width - 1);
+         value[1] = (GLfloat) (ctx->DrawBuffer->Height - 1);
+         value[2] = 0.0F;
+         value[3] = 0.0F;
+         return;
+
       case STATE_ROT_MATRIX_0:
          {
             const int unit = (int) state[2];
@@ -628,6 +635,9 @@ _mesa_program_state_flags(const gl_state_index state[STATE_LENGTH])
       case STATE_PCM_BIAS:
          return _NEW_PIXEL;
 
+      case STATE_FB_SIZE:
+         return _NEW_BUFFERS;
+
       default:
          /* unknown state indexes are silently ignored and
          *  no flag set, since it is handled by the driver.
@@ -828,6 +838,9 @@ append_token(char *dst, gl_state_index k)
    case STATE_SHADOW_AMBIENT:
       append(dst, "CompareFailValue");
       break;
+   case STATE_FB_SIZE:
+      append(dst, "FbSize");
+      break;
    case STATE_ROT_MATRIX_0:
       append(dst, "rotMatrixRow0");
       break;