From 2e6d35809bf4ef60af62f9c84d394e97d5bbe2a7 Mon Sep 17 00:00:00 2001 From: Gurchetan Singh Date: Thu, 30 Jun 2016 15:20:34 -0700 Subject: [PATCH] mesa: Make single-buffered GLES representation internally consistent MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit There are a few places in the code where clearing and reading are done on incorrect buffers for GLES contexts. See comments for details. This fixes 75 GLES3 dEQP tests on the surfaceless platform with no regressions. v2: Corrected unclear comment v3: Make the change in context.c instead of get.c v4: Removed whitespace Reviewed-by: Stéphane Marchesin Reviewed-by: Chad Versace --- src/mesa/main/buffers.c | 14 ++++++++++++-- src/mesa/main/clear.c | 8 ++++++++ src/mesa/main/context.c | 10 ++++++++++ 3 files changed, 30 insertions(+), 2 deletions(-) diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c index e8aedde8777..86696b80c87 100644 --- a/src/mesa/main/buffers.c +++ b/src/mesa/main/buffers.c @@ -173,12 +173,22 @@ draw_buffer_enum_to_bitmask(const struct gl_context *ctx, GLenum buffer) * return -1 for an invalid buffer. */ static gl_buffer_index -read_buffer_enum_to_index(GLenum buffer) +read_buffer_enum_to_index(const struct gl_context *ctx, GLenum buffer) { switch (buffer) { case GL_FRONT: return BUFFER_FRONT_LEFT; case GL_BACK: + if (_mesa_is_gles(ctx)) { + /* In draw_buffer_enum_to_bitmask, when GLES contexts draw to + * GL_BACK with a single-buffered configuration, we actually end + * up drawing to the sole front buffer in our internal + * representation. For consistency, we must read from that + * front left buffer too. + */ + if (!ctx->DrawBuffer->Visual.doubleBufferMode) + return BUFFER_FRONT_LEFT; + } return BUFFER_BACK_LEFT; case GL_RIGHT: return BUFFER_FRONT_RIGHT; @@ -724,7 +734,7 @@ read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb, if (_mesa_is_gles3(ctx) && !is_legal_es3_readbuffer_enum(buffer)) srcBuffer = -1; else - srcBuffer = read_buffer_enum_to_index(buffer); + srcBuffer = read_buffer_enum_to_index(ctx, buffer); if (srcBuffer == -1) { _mesa_error(ctx, GL_INVALID_ENUM, diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c index 35b912cbf10..a1bb36efe24 100644 --- a/src/mesa/main/clear.c +++ b/src/mesa/main/clear.c @@ -267,6 +267,14 @@ make_color_buffer_mask(struct gl_context *ctx, GLint drawbuffer) mask |= BUFFER_BIT_FRONT_RIGHT; break; case GL_BACK: + /* For GLES contexts with a single buffered configuration, we actually + * only have a front renderbuffer, so any clear calls to GL_BACK should + * affect that buffer. See draw_buffer_enum_to_bitmask for details. + */ + if (_mesa_is_gles(ctx)) + if (!ctx->DrawBuffer->Visual.doubleBufferMode) + if (att[BUFFER_FRONT_LEFT].Renderbuffer) + mask |= BUFFER_BIT_FRONT_LEFT; if (att[BUFFER_BACK_LEFT].Renderbuffer) mask |= BUFFER_BIT_BACK_LEFT; if (att[BUFFER_BACK_RIGHT].Renderbuffer) diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c index c30031eced9..574c0fb7cec 100644 --- a/src/mesa/main/context.c +++ b/src/mesa/main/context.c @@ -1667,6 +1667,16 @@ _mesa_make_current( struct gl_context *newCtx, } if (!newCtx->ReadBuffer || _mesa_is_winsys_fbo(newCtx->ReadBuffer)) { _mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer); + /* In _mesa_initialize_window_framebuffer, for single-buffered + * visuals, the ColorReadBuffer is set to be GL_FRONT, even with + * GLES contexts. When calling read_buffer, we verify we are reading + * from GL_BACK in is_legal_es3_readbuffer_enum. But the default is + * incorrect, and certain dEQP tests check this. So fix it here. + */ + if (_mesa_is_gles(newCtx) && + !newCtx->ReadBuffer->Visual.doubleBufferMode) + if (newCtx->ReadBuffer->ColorReadBuffer == GL_FRONT) + newCtx->ReadBuffer->ColorReadBuffer = GL_BACK; } /* XXX only set this flag if we're really changing the draw/read -- 2.30.2