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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5.1
+ *
+ * Copyright (C) 1999-2006 Brian Paul 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 context.h
+ * Mesa context and visual-related functions.
+ *
+ * There are three large Mesa data types/classes which are meant to be
+ * used by device drivers:
+ * - GLcontext: this contains the Mesa rendering state
+ * - GLvisual: this describes the color buffer (RGB vs. ci), whether or not
+ * there's a depth buffer, stencil buffer, etc.
+ * - GLframebuffer: contains pointers to the depth buffer, stencil buffer,
+ * accum buffer and alpha buffers.
+ *
+ * These types should be encapsulated by corresponding device driver
+ * data types. See xmesa.h and xmesaP.h for an example.
+ *
+ * In OOP terms, GLcontext, GLvisual, and GLframebuffer are base classes
+ * which the device driver must derive from.
+ *
+ * The following functions create and destroy these data types.
+ */
+
+
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+
+#include "imports.h"
+#include "mtypes.h"
+
+
+struct _glapi_table;
+
+
+/** \name Visual-related functions */
+/*@{*/
+
+extern GLvisual *
+_mesa_create_visual( GLboolean rgbFlag,
+ GLboolean dbFlag,
+ GLboolean stereoFlag,
+ GLint redBits,
+ GLint greenBits,
+ GLint blueBits,
+ GLint alphaBits,
+ GLint indexBits,
+ GLint depthBits,
+ GLint stencilBits,
+ GLint accumRedBits,
+ GLint accumGreenBits,
+ GLint accumBlueBits,
+ GLint accumAlphaBits,
+ GLint numSamples );
+
+extern GLboolean
+_mesa_initialize_visual( GLvisual *v,
+ GLboolean rgbFlag,
+ GLboolean dbFlag,
+ GLboolean stereoFlag,
+ GLint redBits,
+ GLint greenBits,
+ GLint blueBits,
+ GLint alphaBits,
+ GLint indexBits,
+ GLint depthBits,
+ GLint stencilBits,
+ GLint accumRedBits,
+ GLint accumGreenBits,
+ GLint accumBlueBits,
+ GLint accumAlphaBits,
+ GLint numSamples );
+
+extern void
+_mesa_destroy_visual( GLvisual *vis );
+
+/*@}*/
+
+
+/** \name Context-related functions */
+/*@{*/
+
+extern GLcontext *
+_mesa_create_context( const GLvisual *visual,
+ GLcontext *share_list,
+ const struct dd_function_table *driverFunctions,
+ void *driverContext );
+
+extern GLboolean
+_mesa_initialize_context( GLcontext *ctx,
+ const GLvisual *visual,
+ GLcontext *share_list,
+ const struct dd_function_table *driverFunctions,
+ void *driverContext );
+
+extern void
+_mesa_initialize_context_extra(GLcontext *ctx);
+
+extern void
+_mesa_free_context_data( GLcontext *ctx );
+
+extern void
+_mesa_destroy_context( GLcontext *ctx );
+
+
+extern void
+_mesa_copy_context(const GLcontext *src, GLcontext *dst, GLuint mask);
+
+
+extern void
+_mesa_check_init_viewport(GLcontext *ctx, GLuint width, GLuint height);
+
+extern GLboolean
+_mesa_make_current( GLcontext *ctx, GLframebuffer *drawBuffer,
+ GLframebuffer *readBuffer );
+
+extern GLboolean
+_mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare);
+
+extern GLcontext *
+_mesa_get_current_context(void);
+
+/*@}*/
+
+
+extern void
+_mesa_notifySwapBuffers(__GLcontext *gc);
+
+
+extern struct _glapi_table *
+_mesa_get_dispatch(GLcontext *ctx);
+
+
+void
+_mesa_set_mvp_with_dp4( GLcontext *ctx,
+ GLboolean flag );
+
+
+extern GLboolean
+_mesa_valid_to_render(GLcontext *ctx, const char *where);
+
+
+
+/** \name Miscellaneous */
+/*@{*/
+
+extern void
+_mesa_record_error( GLcontext *ctx, GLenum error );
+
+extern void GLAPIENTRY
+_mesa_Finish( void );
+
+extern void GLAPIENTRY
+_mesa_Flush( void );
+
+/*@}*/
+
+
+/**
+ * \name Macros for flushing buffered rendering commands before state changes,
+ * checking if inside glBegin/glEnd, etc.
+ */
+/*@{*/
+
+/**
+ * Flush vertices.
+ *
+ * \param ctx GL context.
+ * \param newstate new state.
+ *
+ * Checks if dd_function_table::NeedFlush is marked to flush stored vertices,
+ * and calls dd_function_table::FlushVertices if so. Marks
+ * __GLcontextRec::NewState with \p newstate.
+ */
+#define FLUSH_VERTICES(ctx, newstate) \
+do { \
+ if (MESA_VERBOSE & VERBOSE_STATE) \
+ _mesa_debug(ctx, "FLUSH_VERTICES in %s\n", MESA_FUNCTION);\
+ if (ctx->Driver.NeedFlush & FLUSH_STORED_VERTICES) \
+ ctx->Driver.FlushVertices(ctx, FLUSH_STORED_VERTICES); \
+ ctx->NewState |= newstate; \
+} while (0)
+
+/**
+ * Flush current state.
+ *
+ * \param ctx GL context.
+ * \param newstate new state.
+ *
+ * Checks if dd_function_table::NeedFlush is marked to flush current state,
+ * and calls dd_function_table::FlushVertices if so. Marks
+ * __GLcontextRec::NewState with \p newstate.
+ */
+#define FLUSH_CURRENT(ctx, newstate) \
+do { \
+ if (MESA_VERBOSE & VERBOSE_STATE) \
+ _mesa_debug(ctx, "FLUSH_CURRENT in %s\n", MESA_FUNCTION); \
+ if (ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT) \
+ ctx->Driver.FlushVertices(ctx, FLUSH_UPDATE_CURRENT); \
+ ctx->NewState |= newstate; \
+} while (0)
+
+/**
+ * Macro to assert that the API call was made outside the
+ * glBegin()/glEnd() pair, with return value.
+ *
+ * \param ctx GL context.
+ * \param retval value to return value in case the assertion fails.
+ */
+#define ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, retval) \
+do { \
+ if (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END) { \
+ _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd"); \
+ return retval; \
+ } \
+} while (0)
+
+/**
+ * Macro to assert that the API call was made outside the
+ * glBegin()/glEnd() pair.
+ *
+ * \param ctx GL context.
+ */
+#define ASSERT_OUTSIDE_BEGIN_END(ctx) \
+do { \
+ if (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END) { \
+ _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd"); \
+ return; \
+ } \
+} while (0)
+
+/**
+ * Macro to assert that the API call was made outside the
+ * glBegin()/glEnd() pair and flush the vertices.
+ *
+ * \param ctx GL context.
+ */
+#define ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx) \
+do { \
+ ASSERT_OUTSIDE_BEGIN_END(ctx); \
+ FLUSH_VERTICES(ctx, 0); \
+} while (0)
+
+/**
+ * Macro to assert that the API call was made outside the
+ * glBegin()/glEnd() pair and flush the vertices, with return value.
+ *
+ * \param ctx GL context.
+ * \param retval value to return value in case the assertion fails.
+ */
+#define ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, retval) \
+do { \
+ ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, retval); \
+ FLUSH_VERTICES(ctx, 0); \
+} while (0)
+
+/*@}*/
+
+
+
+/**
+ * Is the secondary color needed?
+ */
+#define NEED_SECONDARY_COLOR(CTX) \
+ (((CTX)->Light.Enabled && \
+ (CTX)->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR) \
+ || (CTX)->Fog.ColorSumEnabled \
+ || ((CTX)->VertexProgram._Current && \
+ ((CTX)->VertexProgram._Current != (CTX)->VertexProgram._TnlProgram) && \
+ ((CTX)->VertexProgram._Current->Base.InputsRead & VERT_BIT_COLOR1)) \
+ || ((CTX)->FragmentProgram._Current && \
+ ((CTX)->FragmentProgram._Current != (CTX)->FragmentProgram._TexEnvProgram) && \
+ ((CTX)->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL1)) \
+ )
+
+
+/**
+ * Is RGBA LogicOp enabled?
+ */
+#define RGBA_LOGICOP_ENABLED(CTX) \
+ ((CTX)->Color.ColorLogicOpEnabled || \
+ ((CTX)->Color.BlendEnabled && (CTX)->Color.BlendEquationRGB == GL_LOGIC_OP))
+
+
+#endif /* CONTEXT_H */
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