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fix for gl_ztrick bug (Ove Kaaven)

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This commit is contained in:
Brian Paul 2001-03-19 22:45:52 +00:00
parent 6507d9249d
commit 4e856077b7
1 changed files with 6 additions and 3 deletions
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9
src/mesa/main/matrix.c
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@ -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;