From 62fd280c524b282f2448995a353d94f973d904d4 Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@tungstengraphics.com>
Date: Tue, 24 Jun 2008 16:06:59 +0200
Subject: gallium: Fix whole source being used in u_blit

---
 src/gallium/auxiliary/util/u_blit.c | 70 ++++++++++++++++++++++++++++---------
 1 file changed, 54 insertions(+), 16 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index 28513f54e6..6555dcd588 100644
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -222,6 +222,49 @@ setup_vertex_data(struct blit_state *ctx,
 }
 
 
+/**
+ * Setup vertex data for the textured quad we'll draw.
+ * Note: y=0=top
+ */
+static void
+setup_vertex_data_tex(struct blit_state *ctx,
+                      float x0, float y0, float x1, float y1,
+                      float s0, float t0, float s1, float t1,
+                      float z)
+{
+   void *buf;
+
+   ctx->vertices[0][0][0] = x0;
+   ctx->vertices[0][0][1] = y0;
+   ctx->vertices[0][0][2] = z;
+   ctx->vertices[0][1][0] = s0; /*s*/
+   ctx->vertices[0][1][1] = t0; /*t*/
+
+   ctx->vertices[1][0][0] = x1;
+   ctx->vertices[1][0][1] = y0;
+   ctx->vertices[1][0][2] = z;
+   ctx->vertices[1][1][0] = s1; /*s*/
+   ctx->vertices[1][1][1] = t0; /*t*/
+
+   ctx->vertices[2][0][0] = x1;
+   ctx->vertices[2][0][1] = y1;
+   ctx->vertices[2][0][2] = z;
+   ctx->vertices[2][1][0] = s1;
+   ctx->vertices[2][1][1] = t1;
+
+   ctx->vertices[3][0][0] = x0;
+   ctx->vertices[3][0][1] = y1;
+   ctx->vertices[3][0][2] = z;
+   ctx->vertices[3][1][0] = s0;
+   ctx->vertices[3][1][1] = t1;
+
+   buf = ctx->pipe->winsys->buffer_map(ctx->pipe->winsys, ctx->vbuf,
+                                       PIPE_BUFFER_USAGE_CPU_WRITE);
+
+   memcpy(buf, ctx->vertices, sizeof(ctx->vertices));
+
+   ctx->pipe->winsys->buffer_unmap(ctx->pipe->winsys, ctx->vbuf);
+}
 /**
  * Copy pixel block from src surface to dst surface.
  * Overlapping regions are acceptable.
@@ -382,25 +425,18 @@ util_blit_pixels_tex(struct blit_state *ctx,
    struct pipe_context *pipe = ctx->pipe;
    struct pipe_screen *screen = pipe->screen;
    struct pipe_framebuffer_state fb;
-   const int srcLeft = MIN2(srcX0, srcX1);
-   const int srcTop = MIN2(srcY0, srcY1);
+   float s0, t0, s1, t1;
 
    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
           filter == PIPE_TEX_MIPFILTER_LINEAR);
 
-   if (srcLeft != srcX0) {
-      /* left-right flip */
-      int tmp = dstX0;
-      dstX0 = dstX1;
-      dstX1 = tmp;
-   }
+   assert(tex->width[0] != 0);
+   assert(tex->height[0] != 0);
 
-   if (srcTop != srcY0) {
-      /* up-down flip */
-      int tmp = dstY0;
-      dstY0 = dstY1;
-      dstY1 = tmp;
-   }
+   s0 = srcX0 / (float)tex->width[0];
+   s1 = srcX1 / (float)tex->width[0];
+   t0 = srcY0 / (float)tex->height[0];
+   t1 = srcY1 / (float)tex->height[0];
 
    assert(screen->is_format_supported(screen, dst->format, PIPE_SURFACE));
 
@@ -443,9 +479,11 @@ util_blit_pixels_tex(struct blit_state *ctx,
    cso_set_framebuffer(ctx->cso, &fb);
 
    /* draw quad */
-   setup_vertex_data(ctx,
+   setup_vertex_data_tex(ctx,
                      (float) dstX0, (float) dstY0,
-                     (float) dstX1, (float) dstY1, z);
+                     (float) dstX1, (float) dstY1,
+                     s0, t0, s1, t1,
+                     z);
 
    util_draw_vertex_buffer(ctx->pipe, ctx->vbuf,
                            PIPE_PRIM_TRIANGLE_FAN,
-- 
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