diff options
Diffstat (limited to 'src/mesa/drivers/dri/i915tex/intel_buffers.c')
| -rw-r--r-- | src/mesa/drivers/dri/i915tex/intel_buffers.c | 956 |
1 files changed, 956 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i915tex/intel_buffers.c b/src/mesa/drivers/dri/i915tex/intel_buffers.c new file mode 100644 index 0000000000..d3925bbc1e --- /dev/null +++ b/src/mesa/drivers/dri/i915tex/intel_buffers.c @@ -0,0 +1,956 @@ +/************************************************************************** + * + * 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_screen.h" +#include "intel_context.h" +#include "intel_blit.h" +#include "intel_buffers.h" +#include "intel_depthstencil.h" +#include "intel_fbo.h" +#include "intel_tris.h" +#include "intel_regions.h" +#include "intel_batchbuffer.h" +#include "context.h" +#include "utils.h" +#include "framebuffer.h" +#include "swrast/swrast.h" +#include "vblank.h" + + +/** + * XXX move this into a new dri/common/cliprects.c file. + */ +GLboolean +intel_intersect_cliprects(drm_clip_rect_t * dst, + const drm_clip_rect_t * a, + const drm_clip_rect_t * b) +{ + GLint bx = b->x1; + GLint by = b->y1; + GLint bw = b->x2 - bx; + GLint bh = b->y2 - by; + + if (bx < a->x1) + bw -= a->x1 - bx, bx = a->x1; + if (by < a->y1) + bh -= a->y1 - by, by = a->y1; + if (bx + bw > a->x2) + bw = a->x2 - bx; + if (by + bh > a->y2) + bh = a->y2 - by; + if (bw <= 0) + return GL_FALSE; + if (bh <= 0) + return GL_FALSE; + + dst->x1 = bx; + dst->y1 = by; + dst->x2 = bx + bw; + dst->y2 = by + bh; + + return GL_TRUE; +} + +/** + * 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][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; +} + + + +static void +intelBufferSize(GLframebuffer * buffer, GLuint * width, GLuint * height) +{ + GET_CURRENT_CONTEXT(ctx); + struct intel_context *intel = intel_context(ctx); + /* Need to lock to make sure the driDrawable is uptodate. This + * information is used to resize Mesa's software buffers, so it has + * to be correct. + */ + /* XXX This isn't 100% correct, the given buffer might not be + * bound to the current context! + */ + LOCK_HARDWARE(intel); + if (intel->driDrawable) { + *width = intel->driDrawable->w; + *height = intel->driDrawable->h; + } + else { + *width = 0; + *height = 0; + } + UNLOCK_HARDWARE(intel); +} + + + +/** + * Update the following fields for rendering to a user-created FBO: + * intel->numClipRects + * intel->pClipRects + * intel->drawX + * intel->drawY + */ +static void +intelSetRenderbufferClipRects(struct intel_context *intel) +{ + assert(intel->ctx.DrawBuffer->Width > 0); + assert(intel->ctx.DrawBuffer->Height > 0); + intel->fboRect.x1 = 0; + intel->fboRect.y1 = 0; + intel->fboRect.x2 = intel->ctx.DrawBuffer->Width; + intel->fboRect.y2 = intel->ctx.DrawBuffer->Height; + intel->numClipRects = 1; + intel->pClipRects = &intel->fboRect; + intel->drawX = 0; + intel->drawY = 0; +} + + +/** + * As above, but for rendering to front buffer of a window. + * \sa intelSetRenderbufferClipRects + */ +static void +intelSetFrontClipRects(struct intel_context *intel) +{ + __DRIdrawablePrivate *dPriv = intel->driDrawable; + + if (!dPriv) + return; + + intel->numClipRects = dPriv->numClipRects; + intel->pClipRects = dPriv->pClipRects; + intel->drawX = dPriv->x; + intel->drawY = dPriv->y; +} + + +/** + * As above, but for rendering to back buffer of a window. + */ +static void +intelSetBackClipRects(struct intel_context *intel) +{ + __DRIdrawablePrivate *dPriv = intel->driDrawable; + + if (!dPriv) + return; + + if (intel->sarea->pf_enabled == 0 && dPriv->numBackClipRects == 0) { + /* use the front clip rects */ + intel->numClipRects = dPriv->numClipRects; + intel->pClipRects = dPriv->pClipRects; + intel->drawX = dPriv->x; + intel->drawY = dPriv->y; + } + else { + /* use the back clip rects */ + intel->numClipRects = dPriv->numBackClipRects; + intel->pClipRects = dPriv->pBackClipRects; + intel->drawX = dPriv->backX; + intel->drawY = dPriv->backY; + } +} + + +/** + * This will be called whenever the currently bound window is moved/resized. + * XXX: actually, it seems to NOT be called when the window is only moved (BP). + */ +void +intelWindowMoved(struct intel_context *intel) +{ + GLcontext *ctx = &intel->ctx; + + if (!intel->ctx.DrawBuffer) { + /* when would this happen? -BP */ + intelSetFrontClipRects(intel); + } + else if (intel->ctx.DrawBuffer->Name != 0) { + /* drawing to user-created FBO - do nothing */ + /* Cliprects would be set from intelDrawBuffer() */ + } + else { + /* drawing to a window */ + switch (intel->ctx.DrawBuffer->_ColorDrawBufferMask[0]) { + case BUFFER_BIT_FRONT_LEFT: + intelSetFrontClipRects(intel); + break; + case BUFFER_BIT_BACK_LEFT: + intelSetBackClipRects(intel); + break; + default: + /* glDrawBuffer(GL_NONE or GL_FRONT_AND_BACK): software fallback */ + intelSetFrontClipRects(intel); + } + } + + /* this update Mesa's notion of window size */ + if (ctx->WinSysDrawBuffer) { + _mesa_resize_framebuffer(ctx, ctx->WinSysDrawBuffer, + intel->driDrawable->w, intel->driDrawable->h); + } + + if (intel->intelScreen->driScrnPriv->ddxMinor >= 7 && intel->driDrawable) { + __DRIdrawablePrivate *dPriv = intel->driDrawable; + drmI830Sarea *sarea = intel->sarea; + drm_clip_rect_t drw_rect = { .x1 = dPriv->x, .x2 = dPriv->x + dPriv->w, + .y1 = dPriv->y, .y2 = dPriv->y + dPriv->h }; + drm_clip_rect_t pipeA_rect = { .x1 = sarea->pipeA_x, .y1 = sarea->pipeA_y, + .x2 = sarea->pipeA_x + sarea->pipeA_w, + .y2 = sarea->pipeA_y + sarea->pipeA_h }; + drm_clip_rect_t pipeB_rect = { .x1 = sarea->pipeB_x, .y1 = sarea->pipeB_y, + .x2 = sarea->pipeB_x + sarea->pipeB_w, + .y2 = sarea->pipeB_y + sarea->pipeB_h }; + GLint areaA = driIntersectArea( drw_rect, pipeA_rect ); + GLint areaB = driIntersectArea( drw_rect, pipeB_rect ); + GLuint flags = intel->vblank_flags; + + if (areaB > areaA || (areaA == areaB && areaB > 0)) { + flags = intel->vblank_flags | VBLANK_FLAG_SECONDARY; + } else { + flags = intel->vblank_flags & ~VBLANK_FLAG_SECONDARY; + } + + if (flags != intel->vblank_flags) { + intel->vblank_flags = flags; + driGetCurrentVBlank(dPriv, intel->vblank_flags, &intel->vbl_seq); + } + } else { + intel->vblank_flags &= ~VBLANK_FLAG_SECONDARY; + } + + /* Update hardware scissor */ + ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y, + ctx->Scissor.Width, ctx->Scissor.Height); +} + + + +/* A true meta version of this would be very simple and additionally + * machine independent. Maybe we'll get there one day. + */ +static void +intelClearWithTris(struct intel_context *intel, GLbitfield mask) +{ + GLcontext *ctx = &intel->ctx; + drm_clip_rect_t clear; + + if (INTEL_DEBUG & DEBUG_BLIT) + _mesa_printf("%s 0x%x\n", __FUNCTION__, mask); + + LOCK_HARDWARE(intel); + + /* XXX FBO: was: intel->driDrawable->numClipRects */ + if (intel->numClipRects) { + GLint cx, cy, cw, ch; + GLuint buf; + + intel->vtbl.install_meta_state(intel); + + /* Get clear bounds after locking */ + cx = ctx->DrawBuffer->_Xmin; + cy = ctx->DrawBuffer->_Ymin; + ch = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin; + cw = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin; + + /* note: regardless of 'all', cx, cy, cw, ch are now correct */ + clear.x1 = cx; + clear.y1 = cy; + clear.x2 = cx + cw; + clear.y2 = cy + ch; + + /* Back and stencil cliprects are the same. Try and do both + * buffers at once: + */ + if (mask & + (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) { + struct intel_region *backRegion = + intel_get_rb_region(ctx->DrawBuffer, BUFFER_BACK_LEFT); + struct intel_region *depthRegion = + intel_get_rb_region(ctx->DrawBuffer, BUFFER_DEPTH); + const GLuint clearColor = (backRegion && backRegion->cpp == 4) + ? intel->ClearColor8888 : intel->ClearColor565; + + intel->vtbl.meta_draw_region(intel, backRegion, depthRegion); + + if (mask & BUFFER_BIT_BACK_LEFT) + intel->vtbl.meta_color_mask(intel, GL_TRUE); + else + intel->vtbl.meta_color_mask(intel, GL_FALSE); + + if (mask & BUFFER_BIT_STENCIL) + intel->vtbl.meta_stencil_replace(intel, + intel->ctx.Stencil.WriteMask[0], + intel->ctx.Stencil.Clear); + else + intel->vtbl.meta_no_stencil_write(intel); + + if (mask & BUFFER_BIT_DEPTH) + intel->vtbl.meta_depth_replace(intel); + else + intel->vtbl.meta_no_depth_write(intel); + + /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the + * drawing origin may not be correctly emitted. + */ + intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2, intel->ctx.Depth.Clear, clearColor, 0, 0, 0, 0); /* texcoords */ + + mask &= + ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH); + } + + /* clear the remaining (color) renderbuffers */ + for (buf = 0; buf < BUFFER_COUNT && mask; buf++) { + const GLuint bufBit = 1 << buf; + if (mask & bufBit) { + struct intel_renderbuffer *irbColor = + intel_renderbuffer(ctx->DrawBuffer-> + Attachment[buf].Renderbuffer); + GLuint color = (irbColor->region->cpp == 4) + ? intel->ClearColor8888 : intel->ClearColor565; + + ASSERT(irbColor); + + intel->vtbl.meta_no_depth_write(intel); + intel->vtbl.meta_no_stencil_write(intel); + intel->vtbl.meta_color_mask(intel, GL_TRUE); + intel->vtbl.meta_draw_region(intel, irbColor->region, NULL); + + /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the + * drawing origin may not be correctly emitted. + */ + intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2, 0, /* depth clear val */ + color, 0, 0, 0, 0); /* texcoords */ + + mask &= ~bufBit; + } + } + + intel->vtbl.leave_meta_state(intel); + intel_batchbuffer_flush(intel->batch); + } + UNLOCK_HARDWARE(intel); +} + + + + +/** + * Copy the window contents named by dPriv to the rotated (or reflected) + * color buffer. + * srcBuf is BUFFER_BIT_FRONT_LEFT or BUFFER_BIT_BACK_LEFT to indicate the source. + */ +void +intelRotateWindow(struct intel_context *intel, + __DRIdrawablePrivate * dPriv, GLuint srcBuf) +{ + intelScreenPrivate *screen = intel->intelScreen; + drm_clip_rect_t fullRect; + struct intel_region *src; + const drm_clip_rect_t *clipRects; + int numClipRects; + int i; + GLenum format, type; + + int xOrig, yOrig; + int origNumClipRects; + drm_clip_rect_t *origRects; + + /* + * set up hardware state + */ + intelFlush(&intel->ctx); + + LOCK_HARDWARE(intel); + + if (!intel->numClipRects) { + UNLOCK_HARDWARE(intel); + return; + } + + intel->vtbl.install_meta_state(intel); + + intel->vtbl.meta_no_depth_write(intel); + intel->vtbl.meta_no_stencil_write(intel); + intel->vtbl.meta_color_mask(intel, GL_FALSE); + + + /* save current drawing origin and cliprects (restored at end) */ + xOrig = intel->drawX; + yOrig = intel->drawY; + origNumClipRects = intel->numClipRects; + origRects = intel->pClipRects; + + /* + * set drawing origin, cliprects for full-screen access to rotated screen + */ + fullRect.x1 = 0; + fullRect.y1 = 0; + fullRect.x2 = screen->rotatedWidth; + fullRect.y2 = screen->rotatedHeight; + intel->drawX = 0; + intel->drawY = 0; + intel->numClipRects = 1; + intel->pClipRects = &fullRect; + + intel->vtbl.meta_draw_region(intel, screen->rotated_region, NULL); /* ? */ + + if (srcBuf == BUFFER_BIT_FRONT_LEFT) { + src = intel->intelScreen->front_region; + clipRects = dPriv->pClipRects; + numClipRects = dPriv->numClipRects; + } + else { + src = intel->intelScreen->back_region; + clipRects = dPriv->pBackClipRects; + numClipRects = dPriv->numBackClipRects; + } + + if (src->cpp == 4) { + format = GL_BGRA; + type = GL_UNSIGNED_BYTE; + } + else { + format = GL_BGR; + type = GL_UNSIGNED_SHORT_5_6_5_REV; + } + + /* set the whole screen up as a texture to avoid alignment issues */ + intel->vtbl.meta_tex_rect_source(intel, + src->buffer, + screen->width, + screen->height, src->pitch, format, type); + + intel->vtbl.meta_texture_blend_replace(intel); + + /* + * loop over the source window's cliprects + */ + for (i = 0; i < numClipRects; i++) { + int srcX0 = clipRects[i].x1; + int srcY0 = clipRects[i].y1; + int srcX1 = clipRects[i].x2; + int srcY1 = clipRects[i].y2; + GLfloat verts[4][2], tex[4][2]; + int j; + + /* build vertices for four corners of clip rect */ + verts[0][0] = srcX0; + verts[0][1] = srcY0; + verts[1][0] = srcX1; + verts[1][1] = srcY0; + verts[2][0] = srcX1; + verts[2][1] = srcY1; + verts[3][0] = srcX0; + verts[3][1] = srcY1; + + /* .. and texcoords */ + tex[0][0] = srcX0; + tex[0][1] = srcY0; + tex[1][0] = srcX1; + tex[1][1] = srcY0; + tex[2][0] = srcX1; + tex[2][1] = srcY1; + tex[3][0] = srcX0; + tex[3][1] = srcY1; + + /* transform coords to rotated screen coords */ + + for (j = 0; j < 4; j++) { + matrix23TransformCoordf(&screen->rotMatrix, + &verts[j][0], &verts[j][1]); + } + + /* draw polygon to map source image to dest region */ + intel_meta_draw_poly(intel, 4, verts, 0, 0, tex); + + } /* cliprect loop */ + + intel->vtbl.leave_meta_state(intel); + intel_batchbuffer_flush(intel->batch); + + /* restore original drawing origin and cliprects */ + intel->drawX = xOrig; + intel->drawY = yOrig; + intel->numClipRects = origNumClipRects; + intel->pClipRects = origRects; + + UNLOCK_HARDWARE(intel); +} + + +/** + * Called by ctx->Driver.Clear. + */ +static void +intelClear(GLcontext *ctx, GLbitfield mask) +{ + struct intel_context *intel = intel_context(ctx); + const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask); + GLbitfield tri_mask = 0; + GLbitfield blit_mask = 0; + GLbitfield swrast_mask = 0; + GLuint i; + + if (0) + fprintf(stderr, "%s\n", __FUNCTION__); + + /* HW color buffers (front, back, aux, generic FBO, etc) */ + if (colorMask == ~0) { + /* clear all R,G,B,A */ + /* XXX FBO: need to check if colorbuffers are software RBOs! */ + blit_mask |= (mask & BUFFER_BITS_COLOR); + } + else { + /* glColorMask in effect */ + tri_mask |= (mask & BUFFER_BITS_COLOR); + } + + /* HW stencil */ + if (mask & BUFFER_BIT_STENCIL) { + const struct intel_region *stencilRegion + = intel_get_rb_region(ctx->DrawBuffer, BUFFER_STENCIL); + if (stencilRegion) { + /* have hw stencil */ + if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) { + /* not clearing all stencil bits, so use triangle clearing */ + tri_mask |= BUFFER_BIT_STENCIL; + } + else { + /* clearing all stencil bits, use blitting */ + blit_mask |= BUFFER_BIT_STENCIL; + } + } + } + + /* HW depth */ + if (mask & BUFFER_BIT_DEPTH) { + /* clear depth with whatever method is used for stencil (see above) */ + if (tri_mask & BUFFER_BIT_STENCIL) + tri_mask |= BUFFER_BIT_DEPTH; + else + blit_mask |= BUFFER_BIT_DEPTH; + } + + /* SW fallback clearing */ + swrast_mask = mask & ~tri_mask & ~blit_mask; + + for (i = 0; i < BUFFER_COUNT; i++) { + GLuint bufBit = 1 << i; + if ((blit_mask | tri_mask) & bufBit) { + if (!ctx->DrawBuffer->Attachment[i].Renderbuffer->ClassID) { + blit_mask &= ~bufBit; + tri_mask &= ~bufBit; + swrast_mask |= bufBit; + } + } + } + + + intelFlush(ctx); /* XXX intelClearWithBlit also does this */ + + if (blit_mask) + intelClearWithBlit(ctx, blit_mask); + + if (tri_mask) + intelClearWithTris(intel, tri_mask); + + if (swrast_mask) + _swrast_Clear(ctx, swrast_mask); +} + + + +/* Flip the front & back buffers + */ +static void +intelPageFlip(const __DRIdrawablePrivate * dPriv) +{ +#if 0 + struct intel_context *intel; + int tmp, ret; + + if (INTEL_DEBUG & DEBUG_IOCTL) + fprintf(stderr, "%s\n", __FUNCTION__); + + assert(dPriv); + assert(dPriv->driContextPriv); + assert(dPriv->driContextPriv->driverPrivate); + + intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate; + + intelFlush(&intel->ctx); + LOCK_HARDWARE(intel); + + if (dPriv->pClipRects) { + *(drm_clip_rect_t *) intel->sarea->boxes = dPriv->pClipRects[0]; + intel->sarea->nbox = 1; + } + + ret = drmCommandNone(intel->driFd, DRM_I830_FLIP); + if (ret) { + fprintf(stderr, "%s: %d\n", __FUNCTION__, ret); + UNLOCK_HARDWARE(intel); + exit(1); + } + + tmp = intel->sarea->last_enqueue; + intelRefillBatchLocked(intel); + UNLOCK_HARDWARE(intel); + + + intelSetDrawBuffer(&intel->ctx, intel->ctx.Color.DriverDrawBuffer); +#endif +} + +#if 0 +void +intelSwapBuffers(__DRIdrawablePrivate * dPriv) +{ + if (dPriv->driverPrivate) { + const struct gl_framebuffer *fb + = (struct gl_framebuffer *) dPriv->driverPrivate; + if (fb->Visual.doubleBufferMode) { + GET_CURRENT_CONTEXT(ctx); + if (ctx && ctx->DrawBuffer == fb) { + _mesa_notifySwapBuffers(ctx); /* flush pending rendering */ + } + if (0 /*intel->doPageFlip */ ) { /* doPageFlip is never set !!! */ + intelPageFlip(dPriv); + } + else { + intelCopyBuffer(dPriv); + } + } + } + else { + _mesa_problem(NULL, + "dPriv has no gl_framebuffer pointer in intelSwapBuffers"); + } +} +#else +/* Trunk version: + */ +void +intelSwapBuffers(__DRIdrawablePrivate * dPriv) +{ + if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) { + GET_CURRENT_CONTEXT(ctx); + struct intel_context *intel; + + if (ctx == NULL) + return; + + intel = intel_context(ctx); + + if (ctx->Visual.doubleBufferMode) { + intelScreenPrivate *screen = intel->intelScreen; + _mesa_notifySwapBuffers(ctx); /* flush pending rendering comands */ + if (0 /*intel->doPageFlip */ ) { /* doPageFlip is never set !!! */ + intelPageFlip(dPriv); + } + else { + intelCopyBuffer(dPriv, NULL); + } + if (screen->current_rotation != 0) { + intelRotateWindow(intel, dPriv, BUFFER_BIT_FRONT_LEFT); + } + } + } + else { + /* XXX this shouldn't be an error but we can't handle it for now */ + fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__); + } +} +#endif + +void +intelCopySubBuffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h) +{ + if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) { + struct intel_context *intel = + (struct intel_context *) dPriv->driContextPriv->driverPrivate; + GLcontext *ctx = &intel->ctx; + + if (ctx->Visual.doubleBufferMode) { + drm_clip_rect_t rect; + rect.x1 = x + dPriv->x; + rect.y1 = (dPriv->h - y - h) + dPriv->y; + rect.x2 = rect.x1 + w; + rect.y2 = rect.y1 + h; + _mesa_notifySwapBuffers(ctx); /* flush pending rendering comands */ + intelCopyBuffer(dPriv, &rect); + } + } + else { + /* XXX this shouldn't be an error but we can't handle it for now */ + fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__); + } +} + + +/** + * 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 *colorRegion, *depthRegion = NULL; + struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL; + int front = 0; /* drawing to front color buffer? */ + + if (!fb) { + /* this can happen during the initial context initialization */ + return; + } + + /* Do this here, note core Mesa, since this function is called from + * many places within the driver. + */ + if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) { + /* 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; + } + + if (fb->Name) + intel_validate_paired_depth_stencil(ctx, fb); + + /* + * How many color buffers are we drawing into? + */ + if (fb->_NumColorDrawBuffers[0] != 1 +#if 0 + /* XXX FBO temporary - always use software rendering */ + || 1 +#endif + ) { + /* writing to 0 or 2 or 4 color buffers */ + /*_mesa_debug(ctx, "Software rendering\n");*/ + FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE); + front = 1; /* might not have back color buffer */ + } + else { + /* draw to exactly one color buffer */ + /*_mesa_debug(ctx, "Hardware rendering\n");*/ + FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE); + if (fb->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT) { + front = 1; + } + } + + /* + * Get the intel_renderbuffer for the colorbuffer we're drawing into. + * And set up cliprects. + */ + if (fb->Name == 0) { + /* drawing to window system buffer */ + if (intel->sarea->pf_current_page == 1) { + /* page flipped back/front */ + front ^= 1; + } + if (front) { + intelSetFrontClipRects(intel); + colorRegion = intel_get_rb_region(fb, BUFFER_FRONT_LEFT); + } + else { + intelSetBackClipRects(intel); + colorRegion = intel_get_rb_region(fb, BUFFER_BACK_LEFT); + } + } + else { + /* drawing to user-created FBO */ + struct intel_renderbuffer *irb; + intelSetRenderbufferClipRects(intel); + irb = intel_renderbuffer(fb->_ColorDrawBuffers[0][0]); + colorRegion = (irb && irb->region) ? irb->region : NULL; + } + + /* Update culling direction which changes depending on the + * orientation of the buffer: + */ + if (ctx->Driver.FrontFace) + ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace); + else + ctx->NewState |= _NEW_POLYGON; + + if (!colorRegion) { + 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->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 (for now anyway). + ***/ + if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) { + irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped); + if (irbStencil && irbStencil->region) { + ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT); + FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE); + /* need to re-compute stencil hw state */ + ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled); + if (!depthRegion) + depthRegion = irbStencil->region; + } + 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); + /* need to re-compute stencil hw state */ + ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled); + } + + + /** + ** Release old regions, reference new regions + **/ +#if 0 /* XXX FBO: this seems to be redundant with i915_state_draw_region() */ + if (intel->draw_region != colorRegion) { + intel_region_release(&intel->draw_region); + intel_region_reference(&intel->draw_region, colorRegion); + } + if (intel->intelScreen->depth_region != depthRegion) { + intel_region_release(&intel->intelScreen->depth_region); + intel_region_reference(&intel->intelScreen->depth_region, depthRegion); + } +#endif + + intel->vtbl.set_draw_region(intel, colorRegion, depthRegion); + + /* update viewport since it depends on window size */ + ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y, + ctx->Viewport.Width, ctx->Viewport.Height); + + /* Update hardware scissor */ + ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y, + ctx->Scissor.Width, ctx->Scissor.Height); +} + + +static void +intelDrawBuffer(GLcontext * ctx, GLenum mode) +{ + intel_draw_buffer(ctx, ctx->DrawBuffer); +} + + +static void +intelReadBuffer(GLcontext * ctx, GLenum mode) +{ + 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->Clear = intelClear; + functions->GetBufferSize = intelBufferSize; + functions->ResizeBuffers = _mesa_resize_framebuffer; + functions->DrawBuffer = intelDrawBuffer; + functions->ReadBuffer = intelReadBuffer; +} |