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authorBrian Paul <brian.paul@tungstengraphics.com>2001-03-19 22:45:52 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2001-03-19 22:45:52 +0000
commit4e856077b798c70e14c2d0bb5ea27be9cc87e5c8 (patch)
tree91a697b39afd9c45f0583f9bf29eef29776e96f5 /src/mesa/main
parent6507d9249d8bd47bc6aad10b9b3bb570edf2b84f (diff)
fix for gl_ztrick bug (Ove Kaaven)
Diffstat (limited to 'src/mesa/main')
-rw-r--r--src/mesa/main/matrix.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/mesa/main/matrix.c b/src/mesa/main/matrix.c
index 466911c987..a2b7af02ba 100644
--- a/src/mesa/main/matrix.c
+++ b/src/mesa/main/matrix.c
@@ -1,4 +1,4 @@
-/* $Id: matrix.c,v 1.33 2001/03/03 20:33:27 brianp Exp $ */
+/* $Id: matrix.c,v 1.34 2001/03/19 22:45:52 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -449,6 +449,9 @@ void
_mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height )
{
+ const GLfloat n = ctx->Viewport.Near;
+ const GLfloat f = ctx->Viewport.Far;
+
if (width < 0 || height < 0) {
_mesa_error( ctx, GL_INVALID_VALUE, "glViewport" );
return;
@@ -474,8 +477,8 @@ _mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
ctx->Viewport._WindowMap.m[MAT_TX] = ctx->Viewport._WindowMap.m[MAT_SX] + x;
ctx->Viewport._WindowMap.m[MAT_SY] = (GLfloat) height / 2.0F;
ctx->Viewport._WindowMap.m[MAT_TY] = ctx->Viewport._WindowMap.m[MAT_SY] + y;
- ctx->Viewport._WindowMap.m[MAT_SZ] = 0.5 * ctx->DepthMaxF;
- ctx->Viewport._WindowMap.m[MAT_TZ] = 0.5 * ctx->DepthMaxF;
+ ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0);
+ ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0 + n);
ctx->Viewport._WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
ctx->Viewport._WindowMap.type = MATRIX_3D_NO_ROT;
ctx->NewState |= _NEW_VIEWPORT;