| 0,0 → 1,923 |
|---|
| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2008 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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. |
| */ |
| |
| |
| /** |
| * Functions for allocating/managing framebuffers and renderbuffers. |
| * Also, routines for reading/writing renderbuffer data as ubytes, |
| * ushorts, uints, etc. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "imports.h" |
| #include "blend.h" |
| #include "buffers.h" |
| #include "context.h" |
| #include "enums.h" |
| #include "formats.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| #include "fbobject.h" |
| #include "framebuffer.h" |
| #include "renderbuffer.h" |
| #include "texobj.h" |
| #include "glformats.h" |
| |
| |
| |
| /** |
| * Compute/set the _DepthMax field for the given framebuffer. |
| * This value depends on the Z buffer resolution. |
| */ |
| static void |
| compute_depth_max(struct gl_framebuffer *fb) |
| { |
| if (fb->Visual.depthBits == 0) { |
| /* Special case. Even if we don't have a depth buffer we need |
| * good values for DepthMax for Z vertex transformation purposes |
| * and for per-fragment fog computation. |
| */ |
| fb->_DepthMax = (1 << 16) - 1; |
| } |
| else if (fb->Visual.depthBits < 32) { |
| fb->_DepthMax = (1 << fb->Visual.depthBits) - 1; |
| } |
| else { |
| /* Special case since shift values greater than or equal to the |
| * number of bits in the left hand expression's type are undefined. |
| */ |
| fb->_DepthMax = 0xffffffff; |
| } |
| fb->_DepthMaxF = (GLfloat) fb->_DepthMax; |
| |
| /* Minimum resolvable depth value, for polygon offset */ |
| fb->_MRD = (GLfloat)1.0 / fb->_DepthMaxF; |
| } |
| |
| /** |
| * Create and initialize a gl_framebuffer object. |
| * This is intended for creating _window_system_ framebuffers, not generic |
| * framebuffer objects ala GL_EXT_framebuffer_object. |
| * |
| * \sa _mesa_new_framebuffer |
| */ |
| struct gl_framebuffer * |
| _mesa_create_framebuffer(const struct gl_config *visual) |
| { |
| struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer); |
| assert(visual); |
| if (fb) { |
| _mesa_initialize_window_framebuffer(fb, visual); |
| } |
| return fb; |
| } |
| |
| |
| /** |
| * Allocate a new gl_framebuffer object. |
| * This is the default function for ctx->Driver.NewFramebuffer(). |
| * This is for allocating user-created framebuffers, not window-system |
| * framebuffers! |
| * \sa _mesa_create_framebuffer |
| */ |
| struct gl_framebuffer * |
| _mesa_new_framebuffer(struct gl_context *ctx, GLuint name) |
| { |
| struct gl_framebuffer *fb; |
| (void) ctx; |
| assert(name != 0); |
| fb = CALLOC_STRUCT(gl_framebuffer); |
| if (fb) { |
| _mesa_initialize_user_framebuffer(fb, name); |
| } |
| return fb; |
| } |
| |
| |
| /** |
| * Initialize a gl_framebuffer object. Typically used to initialize |
| * window system-created framebuffers, not user-created framebuffers. |
| * \sa _mesa_initialize_user_framebuffer |
| */ |
| void |
| _mesa_initialize_window_framebuffer(struct gl_framebuffer *fb, |
| const struct gl_config *visual) |
| { |
| assert(fb); |
| assert(visual); |
| |
| memset(fb, 0, sizeof(struct gl_framebuffer)); |
| |
| _glthread_INIT_MUTEX(fb->Mutex); |
| |
| fb->RefCount = 1; |
| |
| /* save the visual */ |
| fb->Visual = *visual; |
| |
| /* Init read/draw renderbuffer state */ |
| if (visual->doubleBufferMode) { |
| fb->_NumColorDrawBuffers = 1; |
| fb->ColorDrawBuffer[0] = GL_BACK; |
| fb->_ColorDrawBufferIndexes[0] = BUFFER_BACK_LEFT; |
| fb->ColorReadBuffer = GL_BACK; |
| fb->_ColorReadBufferIndex = BUFFER_BACK_LEFT; |
| } |
| else { |
| fb->_NumColorDrawBuffers = 1; |
| fb->ColorDrawBuffer[0] = GL_FRONT; |
| fb->_ColorDrawBufferIndexes[0] = BUFFER_FRONT_LEFT; |
| fb->ColorReadBuffer = GL_FRONT; |
| fb->_ColorReadBufferIndex = BUFFER_FRONT_LEFT; |
| } |
| |
| fb->Delete = _mesa_destroy_framebuffer; |
| fb->_Status = GL_FRAMEBUFFER_COMPLETE_EXT; |
| fb->_AllColorBuffersFixedPoint = !visual->floatMode; |
| fb->_HasSNormOrFloatColorBuffer = visual->floatMode; |
| |
| compute_depth_max(fb); |
| } |
| |
| |
| /** |
| * Initialize a user-created gl_framebuffer object. |
| * \sa _mesa_initialize_window_framebuffer |
| */ |
| void |
| _mesa_initialize_user_framebuffer(struct gl_framebuffer *fb, GLuint name) |
| { |
| assert(fb); |
| assert(name); |
| |
| memset(fb, 0, sizeof(struct gl_framebuffer)); |
| |
| fb->Name = name; |
| fb->RefCount = 1; |
| fb->_NumColorDrawBuffers = 1; |
| fb->ColorDrawBuffer[0] = GL_COLOR_ATTACHMENT0_EXT; |
| fb->_ColorDrawBufferIndexes[0] = BUFFER_COLOR0; |
| fb->ColorReadBuffer = GL_COLOR_ATTACHMENT0_EXT; |
| fb->_ColorReadBufferIndex = BUFFER_COLOR0; |
| fb->Delete = _mesa_destroy_framebuffer; |
| _glthread_INIT_MUTEX(fb->Mutex); |
| } |
| |
| |
| /** |
| * Deallocate buffer and everything attached to it. |
| * Typically called via the gl_framebuffer->Delete() method. |
| */ |
| void |
| _mesa_destroy_framebuffer(struct gl_framebuffer *fb) |
| { |
| if (fb) { |
| _mesa_free_framebuffer_data(fb); |
| free(fb); |
| } |
| } |
| |
| |
| /** |
| * Free all the data hanging off the given gl_framebuffer, but don't free |
| * the gl_framebuffer object itself. |
| */ |
| void |
| _mesa_free_framebuffer_data(struct gl_framebuffer *fb) |
| { |
| GLuint i; |
| |
| assert(fb); |
| assert(fb->RefCount == 0); |
| |
| _glthread_DESTROY_MUTEX(fb->Mutex); |
| |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| struct gl_renderbuffer_attachment *att = &fb->Attachment[i]; |
| if (att->Renderbuffer) { |
| _mesa_reference_renderbuffer(&att->Renderbuffer, NULL); |
| } |
| if (att->Texture) { |
| _mesa_reference_texobj(&att->Texture, NULL); |
| } |
| ASSERT(!att->Renderbuffer); |
| ASSERT(!att->Texture); |
| att->Type = GL_NONE; |
| } |
| } |
| |
| |
| /** |
| * Set *ptr to point to fb, with refcounting and locking. |
| * This is normally only called from the _mesa_reference_framebuffer() macro |
| * when there's a real pointer change. |
| */ |
| void |
| _mesa_reference_framebuffer_(struct gl_framebuffer **ptr, |
| struct gl_framebuffer *fb) |
| { |
| if (*ptr) { |
| /* unreference old renderbuffer */ |
| GLboolean deleteFlag = GL_FALSE; |
| struct gl_framebuffer *oldFb = *ptr; |
| |
| _glthread_LOCK_MUTEX(oldFb->Mutex); |
| ASSERT(oldFb->RefCount > 0); |
| oldFb->RefCount--; |
| deleteFlag = (oldFb->RefCount == 0); |
| _glthread_UNLOCK_MUTEX(oldFb->Mutex); |
| |
| if (deleteFlag) |
| oldFb->Delete(oldFb); |
| |
| *ptr = NULL; |
| } |
| assert(!*ptr); |
| |
| if (fb) { |
| _glthread_LOCK_MUTEX(fb->Mutex); |
| fb->RefCount++; |
| _glthread_UNLOCK_MUTEX(fb->Mutex); |
| *ptr = fb; |
| } |
| } |
| |
| |
| /** |
| * Resize the given framebuffer's renderbuffers to the new width and height. |
| * This should only be used for window-system framebuffers, not |
| * user-created renderbuffers (i.e. made with GL_EXT_framebuffer_object). |
| * This will typically be called via ctx->Driver.ResizeBuffers() or directly |
| * from a device driver. |
| * |
| * \note it's possible for ctx to be null since a window can be resized |
| * without a currently bound rendering context. |
| */ |
| void |
| _mesa_resize_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb, |
| GLuint width, GLuint height) |
| { |
| GLuint i; |
| |
| /* XXX I think we could check if the size is not changing |
| * and return early. |
| */ |
| |
| /* Can only resize win-sys framebuffer objects */ |
| assert(_mesa_is_winsys_fbo(fb)); |
| |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| struct gl_renderbuffer_attachment *att = &fb->Attachment[i]; |
| if (att->Type == GL_RENDERBUFFER_EXT && att->Renderbuffer) { |
| struct gl_renderbuffer *rb = att->Renderbuffer; |
| /* only resize if size is changing */ |
| if (rb->Width != width || rb->Height != height) { |
| if (rb->AllocStorage(ctx, rb, rb->InternalFormat, width, height)) { |
| ASSERT(rb->Width == width); |
| ASSERT(rb->Height == height); |
| } |
| else { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "Resizing framebuffer"); |
| /* no return */ |
| } |
| } |
| } |
| } |
| |
| fb->Width = width; |
| fb->Height = height; |
| |
| if (ctx) { |
| /* update scissor / window bounds */ |
| _mesa_update_draw_buffer_bounds(ctx); |
| /* Signal new buffer state so that swrast will update its clipping |
| * info (the CLIP_BIT flag). |
| */ |
| ctx->NewState |= _NEW_BUFFERS; |
| } |
| } |
| |
| /** |
| * Examine all the framebuffer's renderbuffers to update the Width/Height |
| * fields of the framebuffer. If we have renderbuffers with different |
| * sizes, set the framebuffer's width and height to the min size. |
| * Note: this is only intended for user-created framebuffers, not |
| * window-system framebuffes. |
| */ |
| static void |
| update_framebuffer_size(struct gl_context *ctx, struct gl_framebuffer *fb) |
| { |
| GLuint minWidth = ~0, minHeight = ~0; |
| GLuint i; |
| |
| /* user-created framebuffers only */ |
| assert(_mesa_is_user_fbo(fb)); |
| |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| struct gl_renderbuffer_attachment *att = &fb->Attachment[i]; |
| const struct gl_renderbuffer *rb = att->Renderbuffer; |
| if (rb) { |
| minWidth = MIN2(minWidth, rb->Width); |
| minHeight = MIN2(minHeight, rb->Height); |
| } |
| } |
| |
| if (minWidth != ~0) { |
| fb->Width = minWidth; |
| fb->Height = minHeight; |
| } |
| else { |
| fb->Width = 0; |
| fb->Height = 0; |
| } |
| } |
| |
| |
| /** |
| * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields. |
| * These values are computed from the buffer's width and height and |
| * the scissor box, if it's enabled. |
| * \param ctx the GL context. |
| */ |
| void |
| _mesa_update_draw_buffer_bounds(struct gl_context *ctx) |
| { |
| struct gl_framebuffer *buffer = ctx->DrawBuffer; |
| |
| if (!buffer) |
| return; |
| |
| if (_mesa_is_user_fbo(buffer)) { |
| /* user-created framebuffer size depends on the renderbuffers */ |
| update_framebuffer_size(ctx, buffer); |
| } |
| |
| buffer->_Xmin = 0; |
| buffer->_Ymin = 0; |
| buffer->_Xmax = buffer->Width; |
| buffer->_Ymax = buffer->Height; |
| |
| if (ctx->Scissor.Enabled) { |
| if (ctx->Scissor.X > buffer->_Xmin) { |
| buffer->_Xmin = ctx->Scissor.X; |
| } |
| if (ctx->Scissor.Y > buffer->_Ymin) { |
| buffer->_Ymin = ctx->Scissor.Y; |
| } |
| if (ctx->Scissor.X + ctx->Scissor.Width < buffer->_Xmax) { |
| buffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width; |
| } |
| if (ctx->Scissor.Y + ctx->Scissor.Height < buffer->_Ymax) { |
| buffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height; |
| } |
| /* finally, check for empty region */ |
| if (buffer->_Xmin > buffer->_Xmax) { |
| buffer->_Xmin = buffer->_Xmax; |
| } |
| if (buffer->_Ymin > buffer->_Ymax) { |
| buffer->_Ymin = buffer->_Ymax; |
| } |
| } |
| |
| ASSERT(buffer->_Xmin <= buffer->_Xmax); |
| ASSERT(buffer->_Ymin <= buffer->_Ymax); |
| } |
| |
| |
| /** |
| * The glGet queries of the framebuffer red/green/blue size, stencil size, |
| * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can |
| * change depending on the renderbuffer bindings. This function updates |
| * the given framebuffer's Visual from the current renderbuffer bindings. |
| * |
| * This may apply to user-created framebuffers or window system framebuffers. |
| * |
| * Also note: ctx->DrawBuffer->Visual.depthBits might not equal |
| * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits. |
| * The former one is used to convert floating point depth values into |
| * integer Z values. |
| */ |
| void |
| _mesa_update_framebuffer_visual(struct gl_context *ctx, |
| struct gl_framebuffer *fb) |
| { |
| GLuint i; |
| |
| memset(&fb->Visual, 0, sizeof(fb->Visual)); |
| fb->Visual.rgbMode = GL_TRUE; /* assume this */ |
| |
| #if 0 /* this _might_ be needed */ |
| if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { |
| /* leave visual fields zero'd */ |
| return; |
| } |
| #endif |
| |
| /* find first RGB renderbuffer */ |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| if (fb->Attachment[i].Renderbuffer) { |
| const struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer; |
| const GLenum baseFormat = _mesa_get_format_base_format(rb->Format); |
| const gl_format fmt = rb->Format; |
| |
| /* Grab samples and sampleBuffers from any attachment point (assuming |
| * the framebuffer is complete, we'll get the same answer from all |
| * attachments). |
| */ |
| fb->Visual.samples = rb->NumSamples; |
| fb->Visual.sampleBuffers = rb->NumSamples > 0 ? 1 : 0; |
| |
| if (_mesa_is_legal_color_format(ctx, baseFormat)) { |
| fb->Visual.redBits = _mesa_get_format_bits(fmt, GL_RED_BITS); |
| fb->Visual.greenBits = _mesa_get_format_bits(fmt, GL_GREEN_BITS); |
| fb->Visual.blueBits = _mesa_get_format_bits(fmt, GL_BLUE_BITS); |
| fb->Visual.alphaBits = _mesa_get_format_bits(fmt, GL_ALPHA_BITS); |
| fb->Visual.rgbBits = fb->Visual.redBits |
| + fb->Visual.greenBits + fb->Visual.blueBits; |
| if (_mesa_get_format_color_encoding(fmt) == GL_SRGB) |
| fb->Visual.sRGBCapable = ctx->Extensions.EXT_framebuffer_sRGB; |
| break; |
| } |
| } |
| } |
| |
| fb->Visual.floatMode = GL_FALSE; |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| if (fb->Attachment[i].Renderbuffer) { |
| const struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer; |
| const gl_format fmt = rb->Format; |
| |
| if (_mesa_get_format_datatype(fmt) == GL_FLOAT) { |
| fb->Visual.floatMode = GL_TRUE; |
| break; |
| } |
| } |
| } |
| |
| if (fb->Attachment[BUFFER_DEPTH].Renderbuffer) { |
| const struct gl_renderbuffer *rb = |
| fb->Attachment[BUFFER_DEPTH].Renderbuffer; |
| const gl_format fmt = rb->Format; |
| fb->Visual.haveDepthBuffer = GL_TRUE; |
| fb->Visual.depthBits = _mesa_get_format_bits(fmt, GL_DEPTH_BITS); |
| } |
| |
| if (fb->Attachment[BUFFER_STENCIL].Renderbuffer) { |
| const struct gl_renderbuffer *rb = |
| fb->Attachment[BUFFER_STENCIL].Renderbuffer; |
| const gl_format fmt = rb->Format; |
| fb->Visual.haveStencilBuffer = GL_TRUE; |
| fb->Visual.stencilBits = _mesa_get_format_bits(fmt, GL_STENCIL_BITS); |
| } |
| |
| if (fb->Attachment[BUFFER_ACCUM].Renderbuffer) { |
| const struct gl_renderbuffer *rb = |
| fb->Attachment[BUFFER_ACCUM].Renderbuffer; |
| const gl_format fmt = rb->Format; |
| fb->Visual.haveAccumBuffer = GL_TRUE; |
| fb->Visual.accumRedBits = _mesa_get_format_bits(fmt, GL_RED_BITS); |
| fb->Visual.accumGreenBits = _mesa_get_format_bits(fmt, GL_GREEN_BITS); |
| fb->Visual.accumBlueBits = _mesa_get_format_bits(fmt, GL_BLUE_BITS); |
| fb->Visual.accumAlphaBits = _mesa_get_format_bits(fmt, GL_ALPHA_BITS); |
| } |
| |
| compute_depth_max(fb); |
| } |
| |
| |
| /* |
| * Example DrawBuffers scenarios: |
| * |
| * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to |
| * "gl_FragColor" or program writes to the "result.color" register: |
| * |
| * fragment color output renderbuffer |
| * --------------------- --------------- |
| * color[0] Front, Back |
| * |
| * |
| * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to |
| * gl_FragData[i] or program writes to result.color[i] registers: |
| * |
| * fragment color output renderbuffer |
| * --------------------- --------------- |
| * color[0] Front |
| * color[1] Aux0 |
| * color[3] Aux1 |
| * |
| * |
| * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to |
| * gl_FragColor, or fixed function: |
| * |
| * fragment color output renderbuffer |
| * --------------------- --------------- |
| * color[0] Front, Aux0, Aux1 |
| * |
| * |
| * In either case, the list of renderbuffers is stored in the |
| * framebuffer->_ColorDrawBuffers[] array and |
| * framebuffer->_NumColorDrawBuffers indicates the number of buffers. |
| * The renderer (like swrast) has to look at the current fragment shader |
| * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine |
| * how to map color outputs to renderbuffers. |
| * |
| * Note that these two calls are equivalent (for fixed function fragment |
| * shading anyway): |
| * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer) |
| * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]); |
| */ |
| |
| |
| |
| |
| /** |
| * Update the (derived) list of color drawing renderbuffer pointers. |
| * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers |
| * writing colors. |
| */ |
| static void |
| update_color_draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb) |
| { |
| GLuint output; |
| |
| /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */ |
| fb->_ColorDrawBuffers[0] = NULL; |
| |
| for (output = 0; output < fb->_NumColorDrawBuffers; output++) { |
| GLint buf = fb->_ColorDrawBufferIndexes[output]; |
| if (buf >= 0) { |
| fb->_ColorDrawBuffers[output] = fb->Attachment[buf].Renderbuffer; |
| } |
| else { |
| fb->_ColorDrawBuffers[output] = NULL; |
| } |
| } |
| } |
| |
| |
| /** |
| * Update the (derived) color read renderbuffer pointer. |
| * Unlike the DrawBuffer, we can only read from one (or zero) color buffers. |
| */ |
| static void |
| update_color_read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb) |
| { |
| (void) ctx; |
| if (fb->_ColorReadBufferIndex == -1 || |
| fb->DeletePending || |
| fb->Width == 0 || |
| fb->Height == 0) { |
| fb->_ColorReadBuffer = NULL; /* legal! */ |
| } |
| else { |
| ASSERT(fb->_ColorReadBufferIndex >= 0); |
| ASSERT(fb->_ColorReadBufferIndex < BUFFER_COUNT); |
| fb->_ColorReadBuffer |
| = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer; |
| } |
| } |
| |
| |
| /** |
| * Update a gl_framebuffer's derived state. |
| * |
| * Specifically, update these framebuffer fields: |
| * _ColorDrawBuffers |
| * _NumColorDrawBuffers |
| * _ColorReadBuffer |
| * |
| * If the framebuffer is user-created, make sure it's complete. |
| * |
| * The following functions (at least) can effect framebuffer state: |
| * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT, |
| * glRenderbufferStorageEXT. |
| */ |
| static void |
| update_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb) |
| { |
| if (_mesa_is_winsys_fbo(fb)) { |
| /* This is a window-system framebuffer */ |
| /* Need to update the FB's GL_DRAW_BUFFER state to match the |
| * context state (GL_READ_BUFFER too). |
| */ |
| if (fb->ColorDrawBuffer[0] != ctx->Color.DrawBuffer[0]) { |
| _mesa_drawbuffers(ctx, ctx->Const.MaxDrawBuffers, |
| ctx->Color.DrawBuffer, NULL); |
| } |
| } |
| else { |
| /* This is a user-created framebuffer. |
| * Completeness only matters for user-created framebuffers. |
| */ |
| if (fb->_Status != GL_FRAMEBUFFER_COMPLETE) { |
| _mesa_test_framebuffer_completeness(ctx, fb); |
| } |
| } |
| |
| /* Strictly speaking, we don't need to update the draw-state |
| * if this FB is bound as ctx->ReadBuffer (and conversely, the |
| * read-state if this FB is bound as ctx->DrawBuffer), but no |
| * harm. |
| */ |
| update_color_draw_buffers(ctx, fb); |
| update_color_read_buffer(ctx, fb); |
| |
| compute_depth_max(fb); |
| } |
| |
| |
| /** |
| * Update state related to the current draw/read framebuffers. |
| */ |
| void |
| _mesa_update_framebuffer(struct gl_context *ctx) |
| { |
| struct gl_framebuffer *drawFb; |
| struct gl_framebuffer *readFb; |
| |
| assert(ctx); |
| drawFb = ctx->DrawBuffer; |
| readFb = ctx->ReadBuffer; |
| |
| update_framebuffer(ctx, drawFb); |
| if (readFb != drawFb) |
| update_framebuffer(ctx, readFb); |
| |
| _mesa_update_clamp_vertex_color(ctx); |
| _mesa_update_clamp_fragment_color(ctx); |
| } |
| |
| |
| /** |
| * Check if the renderbuffer for a read/draw operation exists. |
| * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA, |
| * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL. |
| * \param reading if TRUE, we're going to read from the buffer, |
| if FALSE, we're going to write to the buffer. |
| * \return GL_TRUE if buffer exists, GL_FALSE otherwise |
| */ |
| static GLboolean |
| renderbuffer_exists(struct gl_context *ctx, |
| struct gl_framebuffer *fb, |
| GLenum format, |
| GLboolean reading) |
| { |
| const struct gl_renderbuffer_attachment *att = fb->Attachment; |
| |
| /* If we don't know the framebuffer status, update it now */ |
| if (fb->_Status == 0) { |
| _mesa_test_framebuffer_completeness(ctx, fb); |
| } |
| |
| if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { |
| return GL_FALSE; |
| } |
| |
| switch (format) { |
| case GL_COLOR: |
| case GL_RED: |
| case GL_GREEN: |
| case GL_BLUE: |
| case GL_ALPHA: |
| case GL_LUMINANCE: |
| case GL_LUMINANCE_ALPHA: |
| case GL_INTENSITY: |
| case GL_RG: |
| case GL_RGB: |
| case GL_BGR: |
| case GL_RGBA: |
| case GL_BGRA: |
| case GL_ABGR_EXT: |
| case GL_RED_INTEGER_EXT: |
| case GL_RG_INTEGER: |
| case GL_GREEN_INTEGER_EXT: |
| case GL_BLUE_INTEGER_EXT: |
| case GL_ALPHA_INTEGER_EXT: |
| case GL_RGB_INTEGER_EXT: |
| case GL_RGBA_INTEGER_EXT: |
| case GL_BGR_INTEGER_EXT: |
| case GL_BGRA_INTEGER_EXT: |
| case GL_LUMINANCE_INTEGER_EXT: |
| case GL_LUMINANCE_ALPHA_INTEGER_EXT: |
| if (reading) { |
| /* about to read from a color buffer */ |
| const struct gl_renderbuffer *readBuf = fb->_ColorReadBuffer; |
| if (!readBuf) { |
| return GL_FALSE; |
| } |
| ASSERT(_mesa_get_format_bits(readBuf->Format, GL_RED_BITS) > 0 || |
| _mesa_get_format_bits(readBuf->Format, GL_ALPHA_BITS) > 0 || |
| _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_LUMINANCE_SIZE) > 0 || |
| _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_INTENSITY_SIZE) > 0 || |
| _mesa_get_format_bits(readBuf->Format, GL_INDEX_BITS) > 0); |
| } |
| else { |
| /* about to draw to zero or more color buffers (none is OK) */ |
| return GL_TRUE; |
| } |
| break; |
| case GL_DEPTH: |
| case GL_DEPTH_COMPONENT: |
| if (att[BUFFER_DEPTH].Type == GL_NONE) { |
| return GL_FALSE; |
| } |
| break; |
| case GL_STENCIL: |
| case GL_STENCIL_INDEX: |
| if (att[BUFFER_STENCIL].Type == GL_NONE) { |
| return GL_FALSE; |
| } |
| break; |
| case GL_DEPTH_STENCIL_EXT: |
| if (att[BUFFER_DEPTH].Type == GL_NONE || |
| att[BUFFER_STENCIL].Type == GL_NONE) { |
| return GL_FALSE; |
| } |
| break; |
| default: |
| _mesa_problem(ctx, |
| "Unexpected format 0x%x in renderbuffer_exists", |
| format); |
| return GL_FALSE; |
| } |
| |
| /* OK */ |
| return GL_TRUE; |
| } |
| |
| |
| /** |
| * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels, |
| * glCopyTex[Sub]Image, etc) exists. |
| * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA, |
| * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL. |
| * \return GL_TRUE if buffer exists, GL_FALSE otherwise |
| */ |
| GLboolean |
| _mesa_source_buffer_exists(struct gl_context *ctx, GLenum format) |
| { |
| return renderbuffer_exists(ctx, ctx->ReadBuffer, format, GL_TRUE); |
| } |
| |
| |
| /** |
| * As above, but for drawing operations. |
| */ |
| GLboolean |
| _mesa_dest_buffer_exists(struct gl_context *ctx, GLenum format) |
| { |
| return renderbuffer_exists(ctx, ctx->DrawBuffer, format, GL_FALSE); |
| } |
| |
| |
| /** |
| * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES query. |
| */ |
| GLenum |
| _mesa_get_color_read_format(struct gl_context *ctx) |
| { |
| if (!ctx->ReadBuffer || !ctx->ReadBuffer->_ColorReadBuffer) { |
| /* The spec is unclear how to handle this case, but NVIDIA's |
| * driver generates GL_INVALID_OPERATION. |
| */ |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT: " |
| "no GL_READ_BUFFER)"); |
| return GL_NONE; |
| } |
| else { |
| const GLenum format = ctx->ReadBuffer->_ColorReadBuffer->Format; |
| const GLenum data_type = _mesa_get_format_datatype(format); |
| |
| if (format == MESA_FORMAT_ARGB8888) |
| return GL_BGRA; |
| else if (format == MESA_FORMAT_RGB565) |
| return GL_BGR; |
| |
| switch (data_type) { |
| case GL_UNSIGNED_INT: |
| case GL_INT: |
| return GL_RGBA_INTEGER; |
| default: |
| return GL_RGBA; |
| } |
| } |
| } |
| |
| |
| /** |
| * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES query. |
| */ |
| GLenum |
| _mesa_get_color_read_type(struct gl_context *ctx) |
| { |
| if (!ctx->ReadBuffer || !ctx->ReadBuffer->_ColorReadBuffer) { |
| /* The spec is unclear how to handle this case, but NVIDIA's |
| * driver generates GL_INVALID_OPERATION. |
| */ |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE: " |
| "no GL_READ_BUFFER)"); |
| return GL_NONE; |
| } |
| else { |
| const GLenum format = ctx->ReadBuffer->_ColorReadBuffer->Format; |
| const GLenum data_type = _mesa_get_format_datatype(format); |
| |
| if (format == MESA_FORMAT_RGB565) |
| return GL_UNSIGNED_SHORT_5_6_5_REV; |
| |
| switch (data_type) { |
| case GL_SIGNED_NORMALIZED: |
| return GL_BYTE; |
| case GL_UNSIGNED_INT: |
| case GL_INT: |
| case GL_FLOAT: |
| return data_type; |
| case GL_UNSIGNED_NORMALIZED: |
| default: |
| return GL_UNSIGNED_BYTE; |
| } |
| } |
| } |
| |
| |
| /** |
| * Returns the read renderbuffer for the specified format. |
| */ |
| struct gl_renderbuffer * |
| _mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx, |
| GLenum format) |
| { |
| const struct gl_framebuffer *rfb = ctx->ReadBuffer; |
| |
| if (_mesa_is_color_format(format)) { |
| return rfb->Attachment[rfb->_ColorReadBufferIndex].Renderbuffer; |
| } else if (_mesa_is_depth_format(format) || |
| _mesa_is_depthstencil_format(format)) { |
| return rfb->Attachment[BUFFER_DEPTH].Renderbuffer; |
| } else { |
| return rfb->Attachment[BUFFER_STENCIL].Renderbuffer; |
| } |
| } |
| |
| |
| /** |
| * Print framebuffer info to stderr, for debugging. |
| */ |
| void |
| _mesa_print_framebuffer(const struct gl_framebuffer *fb) |
| { |
| GLuint i; |
| |
| fprintf(stderr, "Mesa Framebuffer %u at %p\n", fb->Name, (void *) fb); |
| fprintf(stderr, " Size: %u x %u Status: %s\n", fb->Width, fb->Height, |
| _mesa_lookup_enum_by_nr(fb->_Status)); |
| fprintf(stderr, " Attachments:\n"); |
| |
| for (i = 0; i < BUFFER_COUNT; i++) { |
| const struct gl_renderbuffer_attachment *att = &fb->Attachment[i]; |
| if (att->Type == GL_TEXTURE) { |
| const struct gl_texture_image *texImage = att->Renderbuffer->TexImage; |
| fprintf(stderr, |
| " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n", |
| i, att->Texture->Name, att->TextureLevel, att->CubeMapFace, |
| att->Zoffset, att->Complete); |
| fprintf(stderr, " Size: %u x %u x %u Format %s\n", |
| texImage->Width, texImage->Height, texImage->Depth, |
| _mesa_get_format_name(texImage->TexFormat)); |
| } |
| else if (att->Type == GL_RENDERBUFFER) { |
| fprintf(stderr, " %2d: Renderbuffer %u, complete %d\n", |
| i, att->Renderbuffer->Name, att->Complete); |
| fprintf(stderr, " Size: %u x %u Format %s\n", |
| att->Renderbuffer->Width, att->Renderbuffer->Height, |
| _mesa_get_format_name(att->Renderbuffer->Format)); |
| } |
| else { |
| fprintf(stderr, " %2d: none\n", i); |
| } |
| } |
| } |