st/mesa: change viewport Z scale/bias for glBitmap/glDrawPixels

This fixes incorrect Z position of glBitmap, glDraw/CopyPixels for the
svga driver.  Now we use 0.5, 0.5 as is typical for ordinary 3D rendering.

2 files changed, 10 insertions, 4 deletions

diff --git a/src/mesa/state_tracker/st_cb_bitmap.c b/src/mesa/state_tracker/st_cb_bitmap.c
index 8602f6d32b4..5348ebd139f 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.c
+++ b/src/mesa/state_tracker/st_cb_bitmap.c
@@ -486,15 +486,18 @@ draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
       struct pipe_viewport_state vp;
       vp.scale[0] =  0.5f * width;
       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
-      vp.scale[2] = 1.0f;
+      vp.scale[2] = 0.5f;
       vp.scale[3] = 1.0f;
       vp.translate[0] = 0.5f * width;
       vp.translate[1] = 0.5f * height;
-      vp.translate[2] = 0.0f;
+      vp.translate[2] = 0.5f;
       vp.translate[3] = 0.0f;
       cso_set_viewport(cso, &vp);
    }
 
+   /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
+   z = z * 2.0 - 1.0;
+
    /* draw textured quad */
    offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color);
 
diff --git a/src/mesa/state_tracker/st_cb_drawpixels.c b/src/mesa/state_tracker/st_cb_drawpixels.c
index 23db3f19689..3b162d1dad2 100644
--- a/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -601,11 +601,11 @@ draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
       struct pipe_viewport_state vp;
       vp.scale[0] =  0.5f * w;
       vp.scale[1] = -0.5f * h;
-      vp.scale[2] = 1.0f;
+      vp.scale[2] = 0.5f;
       vp.scale[3] = 1.0f;
       vp.translate[0] = 0.5f * w;
       vp.translate[1] = 0.5f * h;
-      vp.translate[2] = 0.0f;
+      vp.translate[2] = 0.5f;
       vp.translate[3] = 0.0f;
       cso_set_viewport(cso, &vp);
    }
@@ -630,6 +630,9 @@ draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
    y0 = (GLfloat) y;
    y1 = y + height * ctx->Pixel.ZoomY;
 
+   /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
+   z = z * 2.0 - 1.0;
+
    draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex,
 	     (GLfloat) width / pt->width[0],
 	     (GLfloat) height / pt->height[0]);