diff options
Diffstat (limited to 'src/mesa/drivers/dri/intel/intel_buffers.c')
| -rw-r--r-- | src/mesa/drivers/dri/intel/intel_buffers.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c new file mode 100644 index 0000000000..1bff344a45 --- /dev/null +++ b/src/mesa/drivers/dri/intel/intel_buffers.c @@ -0,0 +1,325 @@ +/************************************************************************** + * + * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. + * 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, sub license, 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 (including the + * next paragraph) 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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. + * + **************************************************************************/ + +#include "intel_context.h" +#include "intel_buffers.h" +#include "intel_fbo.h" +#include "main/framebuffer.h" + +/** + * Return pointer to current color drawing region, or NULL. + */ +struct intel_region * +intel_drawbuf_region(struct intel_context *intel) +{ + struct intel_renderbuffer *irbColor = + intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]); + if (irbColor) + return irbColor->region; + else + return NULL; +} + +/** + * Return pointer to current color reading region, or NULL. + */ +struct intel_region * +intel_readbuf_region(struct intel_context *intel) +{ + struct intel_renderbuffer *irb + = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer); + if (irb) + return irb->region; + else + return NULL; +} + +/** + * Check if we're about to draw into the front color buffer. + * If so, set the intel->front_buffer_dirty field to true. + */ +void +intel_check_front_buffer_rendering(struct intel_context *intel) +{ + const struct gl_framebuffer *fb = intel->ctx.DrawBuffer; + if (fb->Name == 0) { + /* drawing to window system buffer */ + if (fb->_NumColorDrawBuffers > 0) { + if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) { + intel->front_buffer_dirty = GL_TRUE; + } + } + } +} + + +/** + * Update the hardware state for drawing into a window or framebuffer object. + * + * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other + * places within the driver. + * + * Basically, this needs to be called any time the current framebuffer + * changes, the renderbuffers change, or we need to draw into different + * color buffers. + */ +void +intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb) +{ + struct intel_context *intel = intel_context(ctx); + struct intel_region *colorRegions[MAX_DRAW_BUFFERS], *depthRegion = NULL; + struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL; + + if (!fb) { + /* this can happen during the initial context initialization */ + return; + } + + /* Do this here, not core Mesa, since this function is called from + * many places within the driver. + */ + if (ctx->NewState & _NEW_BUFFERS) { + /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */ + _mesa_update_framebuffer(ctx); + /* this updates the DrawBuffer's Width/Height if it's a FBO */ + _mesa_update_draw_buffer_bounds(ctx); + } + + if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { + /* this may occur when we're called by glBindFrameBuffer() during + * the process of someone setting up renderbuffers, etc. + */ + /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/ + return; + } + + /* How many color buffers are we drawing into? + * + * If there are zero buffers or the buffer is too big, don't configure any + * regions for hardware drawing. We'll fallback to software below. Not + * having regions set makes some of the software fallback paths faster. + */ + if ((fb->Width > ctx->Const.MaxRenderbufferSize) + || (fb->Height > ctx->Const.MaxRenderbufferSize) + || (fb->_NumColorDrawBuffers == 0)) { + /* writing to 0 */ + colorRegions[0] = NULL; + } + else if (fb->_NumColorDrawBuffers > 1) { + int i; + struct intel_renderbuffer *irb; + + for (i = 0; i < fb->_NumColorDrawBuffers; i++) { + irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]); + colorRegions[i] = irb ? irb->region : NULL; + } + } + else { + /* Get the intel_renderbuffer for the single colorbuffer we're drawing + * into. + */ + if (fb->Name == 0) { + /* drawing to window system buffer */ + if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) + colorRegions[0] = intel_get_rb_region(fb, BUFFER_FRONT_LEFT); + else + colorRegions[0] = intel_get_rb_region(fb, BUFFER_BACK_LEFT); + } + else { + /* drawing to user-created FBO */ + struct intel_renderbuffer *irb; + irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]); + colorRegions[0] = (irb && irb->region) ? irb->region : NULL; + } + } + + if (!colorRegions[0]) { + FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE); + } + else { + FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE); + } + + /*** + *** Get depth buffer region and check if we need a software fallback. + *** Note that the depth buffer is usually a DEPTH_STENCIL buffer. + ***/ + if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) { + irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped); + if (irbDepth && irbDepth->region) { + FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE); + depthRegion = irbDepth->region; + } + else { + FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE); + depthRegion = NULL; + } + } + else { + /* not using depth buffer */ + FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE); + depthRegion = NULL; + } + + /*** + *** Stencil buffer + *** This can only be hardware accelerated if we're using a + *** combined DEPTH_STENCIL buffer. + ***/ + if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) { + irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped); + if (irbStencil && irbStencil->region) { + ASSERT(irbStencil->Base.Format == MESA_FORMAT_S8_Z24); + FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE); + } + else { + FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE); + } + } + else { + /* XXX FBO: instead of FALSE, pass ctx->Stencil._Enabled ??? */ + FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE); + } + + /* If we have a (packed) stencil buffer attached but no depth buffer, + * we still need to set up the shared depth/stencil state so we can use it. + */ + if (depthRegion == NULL && irbStencil && irbStencil->region) + depthRegion = irbStencil->region; + + /* + * Update depth and stencil test state + */ + if (ctx->Driver.Enable) { + ctx->Driver.Enable(ctx, GL_DEPTH_TEST, + (ctx->Depth.Test && fb->Visual.depthBits > 0)); + ctx->Driver.Enable(ctx, GL_STENCIL_TEST, + (ctx->Stencil.Enabled && fb->Visual.stencilBits > 0)); + } + else { + /* Mesa's Stencil._Enabled field is updated when + * _NEW_BUFFERS | _NEW_STENCIL, but i965 code assumes that the value + * only changes with _NEW_STENCIL (which seems sensible). So flag it + * here since this is the _NEW_BUFFERS path. + */ + intel->NewGLState |= (_NEW_DEPTH | _NEW_STENCIL); + } + + intel->vtbl.set_draw_region(intel, colorRegions, depthRegion, + fb->_NumColorDrawBuffers); + intel->NewGLState |= _NEW_BUFFERS; + + /* update viewport since it depends on window size */ +#ifdef I915 + intelCalcViewport(ctx); +#else + intel->NewGLState |= _NEW_VIEWPORT; +#endif + /* Set state we know depends on drawable parameters: + */ + if (ctx->Driver.Scissor) + ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y, + ctx->Scissor.Width, ctx->Scissor.Height); + intel->NewGLState |= _NEW_SCISSOR; + + if (ctx->Driver.DepthRange) + ctx->Driver.DepthRange(ctx, + ctx->Viewport.Near, + ctx->Viewport.Far); + + /* Update culling direction which changes depending on the + * orientation of the buffer: + */ + if (ctx->Driver.FrontFace) + ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace); + else + intel->NewGLState |= _NEW_POLYGON; +} + + +static void +intelDrawBuffer(GLcontext * ctx, GLenum mode) +{ + if ((ctx->DrawBuffer != NULL) && (ctx->DrawBuffer->Name == 0)) { + struct intel_context *const intel = intel_context(ctx); + const GLboolean was_front_buffer_rendering = + intel->is_front_buffer_rendering; + + intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT) + || (mode == GL_FRONT); + + /* If we weren't front-buffer rendering before but we are now, + * invalidate our DRI drawable so we'll ask for new buffers + * (including the fake front) before we start rendering again. + */ + if (!was_front_buffer_rendering && intel->is_front_buffer_rendering) + dri2InvalidateDrawable(intel->driContext->driDrawablePriv); + } + + intel_draw_buffer(ctx, ctx->DrawBuffer); +} + + +static void +intelReadBuffer(GLcontext * ctx, GLenum mode) +{ + if ((ctx->DrawBuffer != NULL) && (ctx->DrawBuffer->Name == 0)) { + struct intel_context *const intel = intel_context(ctx); + const GLboolean was_front_buffer_reading = + intel->is_front_buffer_reading; + + intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT) + || (mode == GL_FRONT); + + /* If we weren't front-buffer reading before but we are now, + * invalidate our DRI drawable so we'll ask for new buffers + * (including the fake front) before we start reading again. + */ + if (!was_front_buffer_reading && intel->is_front_buffer_reading) + dri2InvalidateDrawable(intel->driContext->driReadablePriv); + } + + if (ctx->ReadBuffer == ctx->DrawBuffer) { + /* This will update FBO completeness status. + * A framebuffer will be incomplete if the GL_READ_BUFFER setting + * refers to a missing renderbuffer. Calling glReadBuffer can set + * that straight and can make the drawing buffer complete. + */ + intel_draw_buffer(ctx, ctx->DrawBuffer); + } + /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc) + * reference ctx->ReadBuffer and do appropriate state checks. + */ +} + + +void +intelInitBufferFuncs(struct dd_function_table *functions) +{ + functions->DrawBuffer = intelDrawBuffer; + functions->ReadBuffer = intelReadBuffer; +} |