diff options
Diffstat (limited to 'src/mesa/main/buffers.c')
| -rw-r--r-- | src/mesa/main/buffers.c | 393 |
1 files changed, 200 insertions, 193 deletions
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c index 4c5c077669a..35e03d7eb5c 100644 --- a/src/mesa/main/buffers.c +++ b/src/mesa/main/buffers.c @@ -149,7 +149,7 @@ _mesa_Clear( GLbitfield mask ) */ ddMask = 0; if (mask & GL_COLOR_BUFFER_BIT) - ddMask |= ctx->Color._DrawDestMask; + ddMask |= ctx->Color._DrawDestMask[0]; if ((mask & GL_DEPTH_BUFFER_BIT) && ctx->Visual.depthBits > 0) ddMask |= GL_DEPTH_BUFFER_BIT; if ((mask & GL_STENCIL_BUFFER_BIT) && ctx->Visual.stencilBits > 0) @@ -164,6 +164,121 @@ _mesa_Clear( GLbitfield mask ) } + +/** + * Return bitmask of DD_* flags indicating which color buffers are + * available to the rendering context; + */ +static GLuint +supported_buffer_bitmask(const GLcontext *ctx) +{ + GLuint mask = DD_FRONT_LEFT_BIT; /* always have this */ + GLuint i; + + if (ctx->Visual.stereoMode) { + mask |= DD_FRONT_RIGHT_BIT; + if (ctx->Visual.doubleBufferMode) { + mask |= DD_BACK_LEFT_BIT | DD_BACK_RIGHT_BIT; + } + } + else if (ctx->Visual.doubleBufferMode) { + mask |= DD_BACK_LEFT_BIT; + } + + for (i = 0; i < ctx->Visual.numAuxBuffers; i++) { + mask |= (DD_AUX0_BIT << i); + } + + return mask; +} + + +/** + * Helper routine used by glDrawBuffer and glDrawBuffersARB. + * Given a GLenum naming (a) color buffer(s), return the corresponding + * bitmask of DD_* flags. + */ +static GLuint +draw_buffer_enum_to_bitmask(GLenum buffer) +{ + switch (buffer) { + case GL_FRONT: + return DD_FRONT_LEFT_BIT | DD_FRONT_RIGHT_BIT; + case GL_BACK: + return DD_BACK_LEFT_BIT | DD_BACK_RIGHT_BIT; + case GL_NONE: + return 0; + case GL_RIGHT: + return DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; + case GL_FRONT_RIGHT: + return DD_FRONT_RIGHT_BIT; + case GL_BACK_RIGHT: + return DD_BACK_RIGHT_BIT; + case GL_BACK_LEFT: + return DD_BACK_LEFT_BIT; + case GL_FRONT_AND_BACK: + return DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT + | DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; + case GL_LEFT: + return DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT; + case GL_FRONT_LEFT: + return DD_FRONT_LEFT_BIT; + case GL_AUX0: + return DD_AUX0_BIT; + case GL_AUX1: + return DD_AUX1_BIT; + case GL_AUX2: + return DD_AUX2_BIT; + case GL_AUX3: + return DD_AUX3_BIT; + default: + /* error */ + return ~0; + } +} + + +/** + * Helper routine used by glReadBuffer. + * Given a GLenum naming (a) color buffer(s), return the corresponding + * bitmask of DD_* flags. + */ +static GLuint +read_buffer_enum_to_bitmask(GLenum buffer) +{ + switch (buffer) { + case GL_FRONT: + return DD_FRONT_LEFT_BIT; + case GL_BACK: + return DD_BACK_LEFT_BIT; + case GL_RIGHT: + return DD_FRONT_RIGHT_BIT; + case GL_FRONT_RIGHT: + return DD_FRONT_RIGHT_BIT; + case GL_BACK_RIGHT: + return DD_BACK_RIGHT_BIT; + case GL_BACK_LEFT: + return DD_BACK_LEFT_BIT; + case GL_LEFT: + return DD_FRONT_LEFT_BIT; + case GL_FRONT_LEFT: + return DD_FRONT_LEFT_BIT; + case GL_AUX0: + return DD_AUX0_BIT; + case GL_AUX1: + return DD_AUX1_BIT; + case GL_AUX2: + return DD_AUX2_BIT; + case GL_AUX3: + return DD_AUX3_BIT; + default: + /* error */ + return ~0; + } +} + + + /** * Specify which color buffers to draw into. * @@ -179,6 +294,7 @@ _mesa_Clear( GLbitfield mask ) void GLAPIENTRY _mesa_DrawBuffer( GLenum mode ) { + GLenum destMask, supportedMask; GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */ @@ -188,124 +304,22 @@ _mesa_DrawBuffer( GLenum mode ) /* * Do error checking and compute the _DrawDestMask bitfield. */ - switch (mode) { - case GL_FRONT: - /* never an error */ - if (ctx->Visual.stereoMode) - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_FRONT_RIGHT_BIT; - else - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; - break; - case GL_BACK: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK)"); - return; - } - if (ctx->Visual.stereoMode) - ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT | DD_BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT; - break; - case GL_NONE: - /* never an error */ - ctx->Color._DrawDestMask = 0; - break; -#if _HAVE_FULL_GL - case GL_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_RIGHT)"); - return;} - if (ctx->Visual.doubleBufferMode) - ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT; - break; - case GL_FRONT_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_RIGHT)"); - return; - } - ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT; - break; - case GL_BACK_RIGHT: - if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_RIGHT)"); - return; - } - ctx->Color._DrawDestMask = DD_BACK_RIGHT_BIT; - break; - case GL_BACK_LEFT: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_LEFT)"); - return; - } - ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT; - break; - case GL_FRONT_AND_BACK: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_AND_BACK)"); - return; - } - if (ctx->Visual.stereoMode) - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT - | DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT; - break; - case GL_LEFT: - /* never an error */ - if (ctx->Visual.doubleBufferMode) - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT; - else - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; - break; - case GL_FRONT_LEFT: - /* never an error */ - ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; - break; - case GL_AUX0: - if (ctx->Visual.numAuxBuffers >= 1) { - ctx->Color._DrawDestMask = DD_AUX0_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" ); - return; - } - break; - case GL_AUX1: - if (ctx->Visual.numAuxBuffers >= 2) { - ctx->Color._DrawDestMask = DD_AUX1_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" ); - return; - } - break; - case GL_AUX2: - if (ctx->Visual.numAuxBuffers >= 3) { - ctx->Color._DrawDestMask = DD_AUX2_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" ); - return; - } - break; - case GL_AUX3: - if (ctx->Visual.numAuxBuffers >= 4) { - ctx->Color._DrawDestMask = DD_AUX3_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" ); - return; - } - break; -#endif - default: - _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" ); - return; + destMask = draw_buffer_enum_to_bitmask(mode); + if (destMask == ~0) { + _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(mode)"); + return; + } + + supportedMask = supported_buffer_bitmask(ctx); + destMask &= supportedMask; + + if (destMask == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(mode)"); + return; } - ctx->Color.DrawBuffer = mode; + ctx->Color.DrawBuffer[0] = mode; + ctx->Color._DrawDestMask[0] = destMask; ctx->NewState |= _NEW_COLOR; /* @@ -317,6 +331,60 @@ _mesa_DrawBuffer( GLenum mode ) /** + * Called by glDrawBuffersARB; specifies the destination color buffers + * for N fragment program color outputs. + */ +void GLAPIENTRY +_mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers) +{ + GLint i; + GLuint usedBufferMask, supportedMask; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + + if (n < 1 || n > ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)" ); + return; + } + + supportedMask = supported_buffer_bitmask(ctx); + usedBufferMask = 0; + for (i = 0; i < n; i++) { + GLuint destMask = draw_buffer_enum_to_bitmask(buffers[i]); + if (destMask == ~0) { + _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffersARB(buffer)"); + return; + } + destMask &= supportedMask; + if (destMask == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(unsupported buffer)"); + return; + } + if (destMask & usedBufferMask) { + /* can't use a dest buffer more than once! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(duplicated buffer)"); + return; + } + /* update bitmask */ + usedBufferMask |= destMask; + /* save state */ + ctx->Color.DrawBuffer[i] = buffers[i]; + ctx->Color._DrawDestMask[i] = destMask; + } + + ctx->NewState |= _NEW_COLOR; + + /* + * Call device driver function. + */ + if (ctx->Driver.DrawBuffers) + (*ctx->Driver.DrawBuffers)(ctx, n, buffers); +} + + +/** * Set the color buffer source for reading pixels. * * \param mode color buffer. @@ -330,89 +398,24 @@ _mesa_DrawBuffer( GLenum mode ) void GLAPIENTRY _mesa_ReadBuffer( GLenum mode ) { + GLuint srcMask, supportedMask; GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); if (MESA_VERBOSE & VERBOSE_API) _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); - /* - * Do error checking and compute ctx->Pixel._ReadSrcMask. - */ - switch (mode) { - case GL_LEFT: - case GL_FRONT: - case GL_FRONT_LEFT: - /* Front-Left buffer, always exists */ - ctx->Pixel._ReadSrcMask = DD_FRONT_LEFT_BIT; - break; - case GL_BACK: - case GL_BACK_LEFT: - /* Back-Left buffer, requires double buffering */ - if (!ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; - } - ctx->Pixel._ReadSrcMask = DD_BACK_LEFT_BIT; - break; -#if _HAVE_FULL_GL - case GL_FRONT_RIGHT: - case GL_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; - } - ctx->Pixel._ReadSrcMask = DD_FRONT_RIGHT_BIT; - break; - case GL_BACK_RIGHT: - if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; - } - ctx->Pixel._ReadSrcMask = DD_BACK_RIGHT_BIT; - break; - case GL_AUX0: - if (ctx->Visual.numAuxBuffers >= 1) { - ctx->Pixel._ReadSrcMask = DD_AUX0_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" ); - return; - } - break; - case GL_AUX1: - if (ctx->Visual.numAuxBuffers >= 2) { - ctx->Pixel._ReadSrcMask = DD_AUX1_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" ); - return; - } - break; - case GL_AUX2: - if (ctx->Visual.numAuxBuffers >= 3) { - ctx->Pixel._ReadSrcMask = DD_AUX2_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" ); - return; - } - break; - case GL_AUX3: - if (ctx->Visual.numAuxBuffers >= 4) { - ctx->Pixel._ReadSrcMask = DD_AUX3_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" ); - return; - } - break; -#endif - default: - _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" ); - return; + srcMask = read_buffer_enum_to_bitmask(mode); + if (srcMask == ~0) { + _mesa_error(ctx, GL_INVALID_ENUM, "glReadBuffer(mode)"); + return; } - + supportedMask = supported_buffer_bitmask(ctx); + if ((srcMask & supportedMask) == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glReadBuffer(mode)"); + return; + } + ctx->Pixel._ReadSrcMask = srcMask; ctx->Pixel.ReadBuffer = mode; ctx->NewState |= _NEW_PIXEL; @@ -423,6 +426,7 @@ _mesa_ReadBuffer( GLenum mode ) (*ctx->Driver.ReadBuffer)(ctx, mode); } + #if _HAVE_FULL_GL /** @@ -485,6 +489,7 @@ _mesa_ResizeBuffersMESA( void ) } } + /* * XXX move somewhere else someday? */ @@ -550,6 +555,8 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) ctx->Driver.Scissor( ctx, x, y, width, height ); } + + /**********************************************************************/ /** \name State management */ /*@{*/ |