diff options
Diffstat (limited to 'src/mesa/main/image.c')
| -rw-r--r-- | src/mesa/main/image.c | 79 |
1 files changed, 51 insertions, 28 deletions
diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c index caaf281657..e2e7f806ab 100644 --- a/src/mesa/main/image.c +++ b/src/mesa/main/image.c @@ -1,6 +1,6 @@ /* * Mesa 3-D graphics library - * Version: 7.0 + * Version: 7.1 * * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. * @@ -3878,7 +3878,7 @@ _mesa_pack_stencil_span( const GLcontext *ctx, GLuint n, SWAP4BYTE(value); \ } \ } \ - depthValues[i] = CLAMP(GLTYPE2FLOAT(value), 0.0F, 1.0F); \ + depthValues[i] = GLTYPE2FLOAT(value); \ } \ } while (0) @@ -3889,6 +3889,7 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, const struct gl_pixelstore_attrib *srcPacking ) { GLfloat depthTemp[MAX_WIDTH], *depthValues; + GLboolean needClamp = GL_FALSE; /* Look for special cases first. * Not only are these faster, they're less prone to numeric conversion @@ -3918,7 +3919,7 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, /* XXX may want to add additional cases here someday */ } - /* general case path */ + /* general case path follows */ if (dstType == GL_FLOAT) { depthValues = (GLfloat *) dest; @@ -3927,29 +3928,31 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, depthValues = depthTemp; } - /* XXX we need to obey srcPacking->SwapBytes here!!! */ - (void) srcPacking; - - /* convert incoming values to GLfloat */ + /* Convert incoming values to GLfloat. Some conversions will require + * clamping, below. + */ switch (srcType) { case GL_BYTE: - DEPTH_VALUES(GLbyte, BYTE_TO_FLOAT); - break; + DEPTH_VALUES(GLbyte, BYTE_TO_FLOAT); + needClamp = GL_TRUE; + break; case GL_UNSIGNED_BYTE: - DEPTH_VALUES(GLubyte, UBYTE_TO_FLOAT); - break; + DEPTH_VALUES(GLubyte, UBYTE_TO_FLOAT); + break; case GL_SHORT: - DEPTH_VALUES(GLshort, SHORT_TO_FLOAT); - break; + DEPTH_VALUES(GLshort, SHORT_TO_FLOAT); + needClamp = GL_TRUE; + break; case GL_UNSIGNED_SHORT: - DEPTH_VALUES(GLushort, USHORT_TO_FLOAT); - break; + DEPTH_VALUES(GLushort, USHORT_TO_FLOAT); + break; case GL_INT: - DEPTH_VALUES(GLint, INT_TO_FLOAT); - break; + DEPTH_VALUES(GLint, INT_TO_FLOAT); + needClamp = GL_TRUE; + break; case GL_UNSIGNED_INT: - DEPTH_VALUES(GLuint, UINT_TO_FLOAT); - break; + DEPTH_VALUES(GLuint, UINT_TO_FLOAT); + break; case GL_UNSIGNED_INT_24_8_EXT: /* GL_EXT_packed_depth_stencil */ if (dstType == GL_UNSIGNED_INT && depthScale == (GLfloat) 0xffffff && @@ -3981,19 +3984,21 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, } break; case GL_FLOAT: - DEPTH_VALUES(GLfloat, 1*); - break; + DEPTH_VALUES(GLfloat, 1*); + needClamp = GL_TRUE; + break; case GL_HALF_FLOAT_ARB: { GLuint i; const GLhalfARB *src = (const GLhalfARB *) source; for (i = 0; i < n; i++) { - GLhalfARB value = src[i]; - if (srcPacking->SwapBytes) { - SWAP2BYTE(value); - } + GLhalfARB value = src[i]; + if (srcPacking->SwapBytes) { + SWAP2BYTE(value); + } depthValues[i] = _mesa_half_to_float(value); } + needClamp = GL_TRUE; } break; default: @@ -4001,12 +4006,30 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, return; } + /* apply depth scale and bias */ + { + const GLfloat scale = ctx->Pixel.DepthScale; + const GLfloat bias = ctx->Pixel.DepthBias; + if (scale != 1.0 || bias != 0.0) { + GLuint i; + for (i = 0; i < n; i++) { + depthValues[i] = depthValues[i] * scale + bias; + } + needClamp = GL_TRUE; + } + } - /* apply depth scale and bias and clamp to [0,1] */ - if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0) { - _mesa_scale_and_bias_depth(ctx, n, depthValues); + /* clamp to [0, 1] */ + if (needClamp) { + GLuint i; + for (i = 0; i < n; i++) { + depthValues[i] = CLAMP(depthValues[i], 0.0, 1.0); + } } + /* + * Convert values to dstType + */ if (dstType == GL_UNSIGNED_INT) { GLuint *zValues = (GLuint *) dest; GLuint i; |