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Diffstat (limited to 'src/mesa/main/viewport.c')
| -rw-r--r-- | src/mesa/main/viewport.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c new file mode 100644 index 0000000000..ead856d32c --- /dev/null +++ b/src/mesa/main/viewport.c @@ -0,0 +1,176 @@ +/* + * Mesa 3-D graphics library + * Version: 7.5 + * + * Copyright (C) 2009 VMware, Inc. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +/** + * \file viewport.c + * glViewport and glDepthRange functions. + */ + + +#include "context.h" +#include "macros.h" +#include "viewport.h" + + +/** + * Set the viewport. + * \sa Called via glViewport() or display list execution. + * + * Flushes the vertices and calls _mesa_set_viewport() with the given + * parameters. + */ +void GLAPIENTRY +_mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + _mesa_set_viewport(ctx, x, y, width, height); +} + + +/** + * Set new viewport parameters and update derived state (the _WindowMap + * matrix). Usually called from _mesa_Viewport(). + * + * \param ctx GL context. + * \param x, y coordinates of the lower left corner of the viewport rectangle. + * \param width width of the viewport rectangle. + * \param height height of the viewport rectangle. + */ +void +_mesa_set_viewport(GLcontext *ctx, GLint x, GLint y, + GLsizei width, GLsizei height) +{ + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height); + + if (width < 0 || height < 0) { + _mesa_error(ctx, GL_INVALID_VALUE, + "glViewport(%d, %d, %d, %d)", x, y, width, height); + return; + } + + /* clamp width and height to the implementation dependent range */ + width = CLAMP(width, 1, (GLsizei) ctx->Const.MaxViewportWidth); + height = CLAMP(height, 1, (GLsizei) ctx->Const.MaxViewportHeight); + + ctx->Viewport.X = x; + ctx->Viewport.Width = width; + ctx->Viewport.Y = y; + ctx->Viewport.Height = height; + ctx->NewState |= _NEW_VIEWPORT; + +#if 1 + /* XXX remove this someday. Currently the DRI drivers rely on + * the WindowMap matrix being up to date in the driver's Viewport + * and DepthRange functions. + */ + _math_matrix_viewport(&ctx->Viewport._WindowMap, + ctx->Viewport.X, ctx->Viewport.Y, + ctx->Viewport.Width, ctx->Viewport.Height, + ctx->Viewport.Near, ctx->Viewport.Far, + ctx->DrawBuffer->_DepthMaxF); +#endif + + if (ctx->Driver.Viewport) { + /* Many drivers will use this call to check for window size changes + * and reallocate the z/stencil/accum/etc buffers if needed. + */ + ctx->Driver.Viewport(ctx, x, y, width, height); + } +} + + +/** + * Called by glDepthRange + * + * \param nearval specifies the Z buffer value which should correspond to + * the near clip plane + * \param farval specifies the Z buffer value which should correspond to + * the far clip plane + */ +void GLAPIENTRY +_mesa_DepthRange(GLclampd nearval, GLclampd farval) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + + if (MESA_VERBOSE&VERBOSE_API) + _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval); + + ctx->Viewport.Near = (GLfloat) CLAMP(nearval, 0.0, 1.0); + ctx->Viewport.Far = (GLfloat) CLAMP(farval, 0.0, 1.0); + ctx->NewState |= _NEW_VIEWPORT; + +#if 1 + /* XXX remove this someday. Currently the DRI drivers rely on + * the WindowMap matrix being up to date in the driver's Viewport + * and DepthRange functions. + */ + _math_matrix_viewport(&ctx->Viewport._WindowMap, + ctx->Viewport.X, ctx->Viewport.Y, + ctx->Viewport.Width, ctx->Viewport.Height, + ctx->Viewport.Near, ctx->Viewport.Far, + ctx->DrawBuffer->_DepthMaxF); +#endif + + if (ctx->Driver.DepthRange) { + ctx->Driver.DepthRange(ctx, nearval, farval); + } +} + + + +/** + * Initialize the context viewport attribute group. + * \param ctx the GL context. + */ +void _mesa_init_viewport(GLcontext *ctx) +{ + GLfloat depthMax = 65535.0F; /* sorf of arbitrary */ + + /* Viewport group */ + ctx->Viewport.X = 0; + ctx->Viewport.Y = 0; + ctx->Viewport.Width = 0; + ctx->Viewport.Height = 0; + ctx->Viewport.Near = 0.0; + ctx->Viewport.Far = 1.0; + _math_matrix_ctr(&ctx->Viewport._WindowMap); + + _math_matrix_viewport(&ctx->Viewport._WindowMap, 0, 0, 0, 0, + 0.0F, 1.0F, depthMax); +} + + +/** + * Free the context viewport attribute group data. + * \param ctx the GL context. + */ +void _mesa_free_viewport_data(GLcontext *ctx) +{ + _math_matrix_dtr(&ctx->Viewport._WindowMap); +} + |