X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fswrast%2Fs_depth.c;h=58440cb97bd68203a41023b094fd7b620f6528ed;hb=12d69fca096facf0ddb4642faaed4d5f02d76848;hp=c37a54eb3eb4fd85bef03a742774dabf23b69955;hpb=32ec3f26731ac998b6fda7ce596ec568d6f76eeb;p=mesa.git

diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c
index c37a54eb3eb..58440cb97bd 100644
--- a/src/mesa/swrast/s_depth.c
+++ b/src/mesa/swrast/s_depth.c
@@ -28,10 +28,8 @@
 #include "main/formats.h"
 #include "main/macros.h"
 #include "main/imports.h"
-#include "main/fbobject.h"
 
 #include "s_depth.h"
-#include "s_context.h"
 #include "s_span.h"
 
 
@@ -42,7 +40,7 @@
  * Return:  number of fragments which pass the test.
  */
 static GLuint
-depth_test_span16( GLcontext *ctx, GLuint n,
+depth_test_span16( struct gl_context *ctx, GLuint n,
                    GLushort zbuffer[], const GLuint z[], GLubyte mask[] )
 {
    GLuint passed = 0;
@@ -260,7 +258,7 @@ depth_test_span16( GLcontext *ctx, GLuint n,
 	 }
 	 break;
       case GL_NEVER:
-         _mesa_bzero(mask, n * sizeof(GLubyte));
+         memset(mask, 0, n * sizeof(GLubyte));
 	 break;
       default:
          _mesa_problem(ctx, "Bad depth func in depth_test_span16");
@@ -271,7 +269,7 @@ depth_test_span16( GLcontext *ctx, GLuint n,
 
 
 static GLuint
-depth_test_span32( GLcontext *ctx, GLuint n,
+depth_test_span32( struct gl_context *ctx, GLuint n,
                    GLuint zbuffer[], const GLuint z[], GLubyte mask[] )
 {
    GLuint passed = 0;
@@ -489,7 +487,7 @@ depth_test_span32( GLcontext *ctx, GLuint n,
 	 }
 	 break;
       case GL_NEVER:
-         _mesa_bzero(mask, n * sizeof(GLubyte));
+         memset(mask, 0, n * sizeof(GLubyte));
 	 break;
       default:
          _mesa_problem(ctx, "Bad depth func in depth_test_span32");
@@ -498,17 +496,24 @@ depth_test_span32( GLcontext *ctx, GLuint n,
    return passed;
 }
 
-/* Apply ARB_depth_clamp to span of fragments. */
+
+
+/**
+ * Clamp fragment Z values to the depth near/far range (glDepthRange()).
+ * This is used when GL_ARB_depth_clamp/GL_DEPTH_CLAMP is turned on.
+ * In that case, vertexes are not clipped against the near/far planes
+ * so rasterization will produce fragment Z values outside the usual
+ * [0,1] range.
+ */
 void
-_swrast_depth_clamp_span( GLcontext *ctx, SWspan *span )
+_swrast_depth_clamp_span( struct gl_context *ctx, SWspan *span )
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
-   struct gl_renderbuffer *rb = fb->_DepthBuffer;
    const GLuint count = span->end;
-   GLuint *zValues = span->array->z;
-   GLuint min, max;
+   GLint *zValues = (GLint *) span->array->z; /* sign change */
+   GLint min, max;
    GLfloat min_f, max_f;
-   int i;
+   GLuint i;
 
    if (ctx->Viewport.Near < ctx->Viewport.Far) {
       min_f = ctx->Viewport.Near;
@@ -518,15 +523,21 @@ _swrast_depth_clamp_span( GLcontext *ctx, SWspan *span )
       max_f = ctx->Viewport.Near;
    }
 
-   if (rb->DataType == GL_UNSIGNED_SHORT) {
-      CLAMPED_FLOAT_TO_USHORT(min, min_f);
-      CLAMPED_FLOAT_TO_USHORT(max, max_f);
-   } else {
-      assert(rb->DataType == GL_UNSIGNED_INT);
-      min = FLOAT_TO_UINT(min_f);
-      max = FLOAT_TO_UINT(max_f);
-   }
-
+   /* Convert floating point values in [0,1] to device Z coordinates in
+    * [0, DepthMax].
+    * ex: If the Z buffer has 24 bits, DepthMax = 0xffffff.
+    * 
+    * XXX this all falls apart if we have 31 or more bits of Z because
+    * the triangle rasterization code produces unsigned Z values.  Negative
+    * vertex Z values come out as large fragment Z uints.
+    */
+   min = (GLint) (min_f * fb->_DepthMaxF);
+   max = (GLint) (max_f * fb->_DepthMaxF);
+   if (max < 0)
+      max = 0x7fffffff; /* catch over flow for 30-bit z */
+
+   /* Note that we do the comparisons here using signed integers.
+    */
    for (i = 0; i < count; i++) {
       if (zValues[i] < min)
 	 zValues[i] = min;
@@ -541,7 +552,7 @@ _swrast_depth_clamp_span( GLcontext *ctx, SWspan *span )
  * Apply depth test to span of fragments.
  */
 static GLuint
-depth_test_span( GLcontext *ctx, SWspan *span)
+depth_test_span( struct gl_context *ctx, SWspan *span)
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
    struct gl_renderbuffer *rb = fb->_DepthBuffer;
@@ -599,7 +610,7 @@ depth_test_span( GLcontext *ctx, SWspan *span)
  * Do depth testing for an array of fragments at assorted locations.
  */
 static void
-direct_depth_test_pixels16(GLcontext *ctx, GLushort *zStart, GLuint stride,
+direct_depth_test_pixels16(struct gl_context *ctx, GLushort *zStart, GLuint stride,
                            GLuint n, const GLint x[], const GLint y[],
                            const GLuint z[], GLubyte mask[] )
 {
@@ -832,7 +843,7 @@ direct_depth_test_pixels16(GLcontext *ctx, GLushort *zStart, GLuint stride,
 	 break;
       case GL_NEVER:
 	 /* depth test never passes */
-         _mesa_bzero(mask, n * sizeof(GLubyte));
+         memset(mask, 0, n * sizeof(GLubyte));
 	 break;
       default:
          _mesa_problem(ctx, "Bad depth func in direct_depth_test_pixels");
@@ -845,7 +856,7 @@ direct_depth_test_pixels16(GLcontext *ctx, GLushort *zStart, GLuint stride,
  * Do depth testing for an array of fragments with direct access to zbuffer.
  */
 static void
-direct_depth_test_pixels32(GLcontext *ctx, GLuint *zStart, GLuint stride,
+direct_depth_test_pixels32(struct gl_context *ctx, GLuint *zStart, GLuint stride,
                            GLuint n, const GLint x[], const GLint y[],
                            const GLuint z[], GLubyte mask[] )
 {
@@ -1078,7 +1089,7 @@ direct_depth_test_pixels32(GLcontext *ctx, GLuint *zStart, GLuint stride,
 	 break;
       case GL_NEVER:
 	 /* depth test never passes */
-         _mesa_bzero(mask, n * sizeof(GLubyte));
+         memset(mask, 0, n * sizeof(GLubyte));
 	 break;
       default:
          _mesa_problem(ctx, "Bad depth func in direct_depth_test_pixels");
@@ -1089,7 +1100,7 @@ direct_depth_test_pixels32(GLcontext *ctx, GLuint *zStart, GLuint stride,
 
 
 static GLuint
-depth_test_pixels( GLcontext *ctx, SWspan *span )
+depth_test_pixels( struct gl_context *ctx, SWspan *span )
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
    struct gl_renderbuffer *rb = fb->_DepthBuffer;
@@ -1139,7 +1150,7 @@ depth_test_pixels( GLcontext *ctx, SWspan *span )
  * \return approx number of pixels that passed (only zero is reliable)
  */
 GLuint
-_swrast_depth_test_span( GLcontext *ctx, SWspan *span)
+_swrast_depth_test_span( struct gl_context *ctx, SWspan *span)
 {
    if (span->arrayMask & SPAN_XY)
       return depth_test_pixels(ctx, span);
@@ -1156,7 +1167,7 @@ _swrast_depth_test_span( GLcontext *ctx, SWspan *span)
  * \return GL_TRUE if any fragments pass, GL_FALSE if no fragments pass
  */
 GLboolean
-_swrast_depth_bounds_test( GLcontext *ctx, SWspan *span )
+_swrast_depth_bounds_test( struct gl_context *ctx, SWspan *span )
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
    struct gl_renderbuffer *rb = fb->_DepthBuffer;
@@ -1241,14 +1252,14 @@ _swrast_depth_bounds_test( GLcontext *ctx, SWspan *span )
  * _swrast_ReadPixels.
  */
 void
-_swrast_read_depth_span_float( GLcontext *ctx, struct gl_renderbuffer *rb,
+_swrast_read_depth_span_float( struct gl_context *ctx, struct gl_renderbuffer *rb,
                                GLint n, GLint x, GLint y, GLfloat depth[] )
 {
    const GLfloat scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
 
    if (!rb) {
       /* really only doing this to prevent FP exceptions later */
-      _mesa_bzero(depth, n * sizeof(GLfloat));
+      memset(depth, 0, n * sizeof(GLfloat));
       return;
    }
 
@@ -1257,7 +1268,7 @@ _swrast_read_depth_span_float( GLcontext *ctx, struct gl_renderbuffer *rb,
    if (y < 0 || y >= (GLint) rb->Height ||
        x + n <= 0 || x >= (GLint) rb->Width) {
       /* span is completely outside framebuffer */
-      _mesa_bzero(depth, n * sizeof(GLfloat));
+      memset(depth, 0, n * sizeof(GLfloat));
       return;
    }
 
@@ -1307,14 +1318,14 @@ _swrast_read_depth_span_float( GLcontext *ctx, struct gl_renderbuffer *rb,
  * As above, but return 32-bit GLuint values.
  */
 void
-_swrast_read_depth_span_uint( GLcontext *ctx, struct gl_renderbuffer *rb,
+_swrast_read_depth_span_uint( struct gl_context *ctx, struct gl_renderbuffer *rb,
                               GLint n, GLint x, GLint y, GLuint depth[] )
 {
    GLuint depthBits;
 
    if (!rb) {
       /* really only doing this to prevent FP exceptions later */
-      _mesa_bzero(depth, n * sizeof(GLuint));
+      memset(depth, 0, n * sizeof(GLuint));
       return;
    }
 
@@ -1325,7 +1336,7 @@ _swrast_read_depth_span_uint( GLcontext *ctx, struct gl_renderbuffer *rb,
    if (y < 0 || y >= (GLint) rb->Height ||
        x + n <= 0 || x >= (GLint) rb->Width) {
       /* span is completely outside framebuffer */
-      _mesa_bzero(depth, n * sizeof(GLfloat));
+      memset(depth, 0, n * sizeof(GLfloat));
       return;
    }
 
@@ -1389,7 +1400,7 @@ _swrast_read_depth_span_uint( GLcontext *ctx, struct gl_renderbuffer *rb,
  * Clear the given z/depth renderbuffer.
  */
 void
-_swrast_clear_depth_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
+_swrast_clear_depth_buffer( struct gl_context *ctx, struct gl_renderbuffer *rb )
 {
    GLuint clearValue;
    GLint x, y, width, height;
@@ -1426,7 +1437,7 @@ _swrast_clear_depth_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
             /* optimized case */
             GLushort *dst = (GLushort *) rb->GetPointer(ctx, rb, x, y);
             GLuint len = width * height * sizeof(GLushort);
-            _mesa_memset(dst, (clearValue & 0xff), len);
+            memset(dst, (clearValue & 0xff), len);
          }
          else {
             /* general case */