mesa: Use floats for viewport bounds.

ARB_viewport_array specifies that DEPTH_RANGE consists of double-
precision parameters (corresponding commit d4dc35987), and a preparatory
commit (6340e609a) added _mesa_get_viewport_xform() which returned
double-precision scale[3] and translate[3] vectors, even though X, Y,
Width, and Height were still floats.

All users of _mesa_get_viewport_xform() immediately convert the double
scale and translation vectors into floats (which were floats originally,
but were converted to doubles in _mesa_get_viewport_xform(), sigh).

i965 at least cannot consume doubles (see SF_CLIP_VIEWPORT). If we want
to pass doubles to hardware, we should have a different function that
does that.

Acked-by: Mathias Froehlich <[email protected]>

2 files changed, 8 insertions, 8 deletions

diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 9917f2de299..7d8914291c3 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -443,12 +443,12 @@ _mesa_ClipControl(GLenum origin, GLenum depth)
  */
 void
 _mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
-                         double scale[3], double translate[3])
+                         float scale[3], float translate[3])
 {
-   double x = ctx->ViewportArray[i].X;
-   double y = ctx->ViewportArray[i].Y;
-   double half_width = 0.5*ctx->ViewportArray[i].Width;
-   double half_height = 0.5*ctx->ViewportArray[i].Height;
+   float x = ctx->ViewportArray[i].X;
+   float y = ctx->ViewportArray[i].Y;
+   float half_width = 0.5f * ctx->ViewportArray[i].Width;
+   float half_height = 0.5f * ctx->ViewportArray[i].Height;
    double n = ctx->ViewportArray[i].Near;
    double f = ctx->ViewportArray[i].Far;
 
@@ -462,8 +462,8 @@ _mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
       translate[1] = half_height + y;
    }
    if (ctx->Transform.ClipDepthMode == GL_NEGATIVE_ONE_TO_ONE) {
-      scale[2] = 0.5*(f - n);
-      translate[2] = 0.5*(n + f);
+      scale[2] = 0.5 * (f - n);
+      translate[2] = 0.5 * (n + f);
    } else {
       scale[2] = f - n;
       translate[2] = n;
diff --git a/src/mesa/main/viewport.h b/src/mesa/main/viewport.h
index 899dc2d0bcc..b0675db1096 100644
--- a/src/mesa/main/viewport.h
+++ b/src/mesa/main/viewport.h
@@ -73,6 +73,6 @@ _mesa_ClipControl(GLenum origin, GLenum depth);
 
 extern void
 _mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
-                         double scale[3], double translate[3]);
+                         float scale[3], float translate[3]);
 
 #endif