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 <Mathias.Froehlich@web.de>

src/mesa/drivers/dri/i915/i915_state.c

@@ -402,7 +402,7 @@ void
 intelCalcViewport(struct gl_context * ctx)
 {
    struct intel_context *intel = intel_context(ctx);
-   double scale[3], translate[3];
+   float scale[3], translate[3];
 
    _mesa_get_viewport_xform(ctx, 0, scale, translate);
 

src/mesa/drivers/dri/i965/brw_sf_state.c

@@ -45,7 +45,7 @@ static void upload_sf_vp(struct brw_context *brw)
    struct gl_context *ctx = &brw->ctx;
    struct brw_sf_viewport *sfv;
    GLfloat y_scale, y_bias;
-   double scale[3], translate[3];
+   float scale[3], translate[3];
    const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 
    sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,

src/mesa/drivers/dri/i965/gen6_viewport_state.c

@@ -101,7 +101,7 @@ gen6_upload_sf_vp(struct brw_context *brw)
    }
 
    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
 
       /* _NEW_VIEWPORT */
       _mesa_get_viewport_xform(ctx, i, scale, translate);

src/mesa/drivers/dri/i965/gen7_viewport_state.c

@@ -53,7 +53,7 @@ gen7_upload_sf_clip_viewport(struct brw_context *brw)
    }
 
    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
       _mesa_get_viewport_xform(ctx, i, scale, translate);
 
       /* According to the "Vertex X,Y Clamping and Quantization" section of

src/mesa/drivers/dri/i965/gen8_viewport_state.c

@@ -53,7 +53,7 @@ gen8_upload_sf_clip_viewport(struct brw_context *brw)
    }
 
    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
       _mesa_get_viewport_xform(ctx, i, scale, translate);
 
       /* _NEW_VIEWPORT: Viewport Matrix Elements */

src/mesa/drivers/dri/r200/r200_state.c

@@ -1546,7 +1546,7 @@ void r200UpdateWindow( struct gl_context *ctx )
    GLfloat xoffset = 0;
    GLfloat yoffset = dPriv ? (GLfloat) dPriv->h : 0;
    const GLboolean render_to_fbo = (ctx->DrawBuffer ? _mesa_is_user_fbo(ctx->DrawBuffer) : 0);
-   double scale[3], translate[3];
+   float scale[3], translate[3];
    GLfloat y_scale, y_bias;
 
    if (render_to_fbo) {

src/mesa/drivers/dri/radeon/radeon_state.c

@@ -1354,7 +1354,7 @@ void radeonUpdateWindow( struct gl_context *ctx )
    GLfloat xoffset = 0.0;
    GLfloat yoffset = dPriv ? (GLfloat) dPriv->h : 0;
    const GLboolean render_to_fbo = (ctx->DrawBuffer ? _mesa_is_user_fbo(ctx->DrawBuffer) : 0);
-   double scale[3], translate[3];
+   float scale[3], translate[3];
    GLfloat y_scale, y_bias;
 
    if (render_to_fbo) {

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;

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

src/mesa/math/m_matrix.c

@@ -1111,8 +1111,8 @@ _math_matrix_translate( GLmatrix *mat, GLfloat x, GLfloat y, GLfloat z )
  * Transforms Normalized Device Coords to window/Z values.
  */
 void
-_math_matrix_viewport(GLmatrix *m, const double scale[3],
-                      const double translate[3], double depthMax)
+_math_matrix_viewport(GLmatrix *m, const float scale[3],
+                      const float translate[3], double depthMax)
 {
    m->m[MAT_SX] = scale[0];
    m->m[MAT_TX] = translate[0];

src/mesa/math/m_matrix.h

@@ -122,8 +122,8 @@ _math_matrix_frustum( GLmatrix *mat,
 		      GLfloat nearval, GLfloat farval );
 
 extern void
-_math_matrix_viewport( GLmatrix *m, const double scale[3],
-                       const double translate[3], double depthMax );
+_math_matrix_viewport( GLmatrix *m, const float scale[3],
+                       const float translate[3], double depthMax );
 
 extern void
 _math_matrix_set_identity( GLmatrix *dest );

src/mesa/state_tracker/st_atom_viewport.c

@@ -64,7 +64,7 @@ update_viewport( struct st_context *st )
     */
    for (i = 0; i < ctx->Const.MaxViewports; i++)
    {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
       _mesa_get_viewport_xform(ctx, i, scale, translate);
 
       st->state.viewport[i].scale[0] = scale[0];

src/mesa/tnl/t_context.c

@@ -190,7 +190,7 @@ _tnl_InvalidateState( struct gl_context *ctx, GLuint new_state )
    }
 
    if (new_state & (_NEW_VIEWPORT | _NEW_BUFFERS)) {
-      double scale[3], translate[3];
+      float scale[3], translate[3];
       _mesa_get_viewport_xform(ctx, 0, scale, translate);
       _math_matrix_viewport(&tnl->_WindowMap, scale, translate,
                             ctx->DrawBuffer->_DepthMaxF);

src/mesa/tnl/t_rasterpos.c

@@ -378,7 +378,7 @@ _tnl_RasterPos(struct gl_context *ctx, const GLfloat vObj[4])
       GLfloat eye[4], clip[4], ndc[3], d;
       GLfloat *norm, eyenorm[3];
       GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
-      double scale[3], translate[3];
+      float scale[3], translate[3];
 
       /* apply modelview matrix:  eye = MV * obj */
       TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, vObj );