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Add blitting fallback for OGL (#2269)

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Co-authored-by: Christophe Dehais <christophe.dehais@fittingbox.com>
This commit is contained in:
Christophe Dehais
2020-09-28 18:53:37 +02:00
committed by GitHub
parent 27f4a2ee47
commit 816026a8bf
3 changed files with 66 additions and 5 deletions
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65
src/renderer_gl.cpp
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@@ -2747,13 +2747,14 @@ namespace bgfx { namespace gl
|| s_extension[Extension:: NV_copy_image].m_supported
|| s_extension[Extension::OES_copy_image].m_supported)
{
m_blitSupported = NULL != glCopyImageSubData;
g_caps.supported |= m_blitSupported
? BGFX_CAPS_TEXTURE_BLIT
: 0
;
m_blitSupported = NULL != glCopyImageSubData;
}
g_caps.supported |= m_blitSupported || BX_ENABLED(BGFX_GL_CONFIG_BLIT_EMULATION)
? BGFX_CAPS_TEXTURE_BLIT
: 0
;
g_caps.supported |= m_readBackSupported
? BGFX_CAPS_TEXTURE_READ_BACK
: 0
@@ -6991,6 +6992,60 @@ namespace bgfx { namespace gl
, height
, bx::uint32_imax(depth, 1)
) );
}
}
else if (BX_ENABLED(BGFX_GL_CONFIG_BLIT_EMULATION) )
{
while (_bs.hasItem(_view) )
{
const BlitItem& bi = _bs.advance();
const TextureGL& src = m_textures[bi.m_src.idx];
const TextureGL& dst = m_textures[bi.m_dst.idx];
uint32_t srcWidth = bx::uint32_min(src.m_width, bi.m_srcX + bi.m_width) - bi.m_srcX;
uint32_t srcHeight = bx::uint32_min(src.m_height, bi.m_srcY + bi.m_height) - bi.m_srcY;
uint32_t dstWidth = bx::uint32_min(dst.m_width, bi.m_dstX + bi.m_width) - bi.m_dstX;
uint32_t dstHeight = bx::uint32_min(dst.m_height, bi.m_dstY + bi.m_height) - bi.m_dstY;
uint32_t dstDepth = bx::uint32_min(dst.m_depth, bi.m_dstZ + bi.m_depth) - bi.m_dstZ;
uint32_t width = bx::uint32_min(srcWidth, dstWidth);
uint32_t height = bx::uint32_min(srcHeight, dstHeight);
BX_ASSERT((bi.m_srcZ == 0) && (bi.m_dstZ == 0) && (bi.m_depth == 0)
, "Blitting 3D regions is not supported"
);
GLuint fbo;
GL_CHECK(glGenFramebuffers(1, &fbo) );
GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, fbo) );
GL_CHECK(glFramebufferTexture2D(GL_FRAMEBUFFER
, GL_COLOR_ATTACHMENT0
, GL_TEXTURE_2D
, src.m_id
, bi.m_srcMip
) );
BX_ASSERT(GL_FRAMEBUFFER_COMPLETE == glCheckFramebufferStatus(GL_FRAMEBUFFER)
, "glCheckFramebufferStatus failed 0x%08x"
, glCheckFramebufferStatus(GL_FRAMEBUFFER)
);
GL_CHECK(glActiveTexture(GL_TEXTURE0) );
GL_CHECK(glBindTexture(GL_TEXTURE_2D, dst.m_id) );
GL_CHECK(glCopyTexSubImage2D(GL_TEXTURE_2D
, bi.m_dstMip
, bi.m_dstX
, bi.m_dstY
, bi.m_srcX
, bi.m_srcY
, width
, height) );
GL_CHECK(glDeleteFramebuffers(1, &fbo) );
GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, 0) );
}
}
}