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[Impeller] Add blit pass (flutter#34901)
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| uniform FragInfo { | ||
| float lod; | ||
| } | ||
| frag_info; | ||
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| uniform sampler2D tex; | ||
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| in vec2 v_uv; | ||
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| out vec4 frag_color; | ||
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| void main() { | ||
| frag_color = textureLod(tex, v_uv, frag_info.lod); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| uniform VertInfo { | ||
| mat4 mvp; | ||
| } | ||
| vert_info; | ||
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| in vec2 vertex_position; | ||
| in vec2 uv; | ||
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| out vec2 v_uv; | ||
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| void main() { | ||
| gl_Position = vert_info.mvp * vec4(vertex_position, 0.0, 1.0); | ||
| v_uv = uv; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,134 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #include "impeller/renderer/backend/gles/blit_command_gles.h" | ||
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| #include "flutter/fml/closure.h" | ||
| #include "impeller/base/validation.h" | ||
| #include "impeller/renderer/backend/gles/texture_gles.h" | ||
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| namespace impeller { | ||
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| BlitEncodeGLES::~BlitEncodeGLES() = default; | ||
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| static void DeleteFBO(const ProcTableGLES& gl, GLuint fbo, GLenum type) { | ||
| if (fbo != GL_NONE) { | ||
| gl.BindFramebuffer(type, GL_NONE); | ||
| gl.DeleteFramebuffers(1u, &fbo); | ||
| } | ||
| }; | ||
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| static std::optional<GLuint> ConfigureFBO( | ||
| const ProcTableGLES& gl, | ||
| const std::shared_ptr<Texture>& texture, | ||
| GLenum fbo_type) { | ||
| auto handle = TextureGLES::Cast(texture.get())->GetGLHandle(); | ||
| if (!handle.has_value()) { | ||
| return std::nullopt; | ||
| } | ||
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| if (TextureGLES::Cast(*texture).IsWrapped()) { | ||
| // The texture is attached to the default FBO, so there's no need to | ||
| // create/configure one. | ||
| gl.BindFramebuffer(fbo_type, 0); | ||
| return 0; | ||
| } | ||
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| GLuint fbo; | ||
| gl.GenFramebuffers(1u, &fbo); | ||
| gl.BindFramebuffer(fbo_type, fbo); | ||
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| if (!TextureGLES::Cast(*texture).SetAsFramebufferAttachment( | ||
| fbo_type, fbo, TextureGLES::AttachmentPoint::kColor0)) { | ||
| VALIDATION_LOG << "Could not attach texture to framebuffer."; | ||
| DeleteFBO(gl, fbo, fbo_type); | ||
| return std::nullopt; | ||
| } | ||
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| if (gl.CheckFramebufferStatus(fbo_type) != GL_FRAMEBUFFER_COMPLETE) { | ||
| VALIDATION_LOG << "Could not create a complete frambuffer."; | ||
| DeleteFBO(gl, fbo, fbo_type); | ||
| return std::nullopt; | ||
| } | ||
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| return fbo; | ||
| }; | ||
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| BlitCopyTextureToTextureCommandGLES::~BlitCopyTextureToTextureCommandGLES() = | ||
| default; | ||
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| std::string BlitCopyTextureToTextureCommandGLES::GetLabel() const { | ||
| return label; | ||
| } | ||
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| bool BlitCopyTextureToTextureCommandGLES::Encode( | ||
| const ReactorGLES& reactor) const { | ||
| const auto& gl = reactor.GetProcTable(); | ||
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| // glBlitFramebuffer is a GLES3 proc. Since we target GLES2, we need to | ||
| // emulate the blit when it's not available in the driver. | ||
| if (!gl.BlitFramebuffer.IsAvailable()) { | ||
| // TODO(bdero): Emulate the blit using a raster draw call here. | ||
| FML_LOG(ERROR) << "Texture blit fallback not implemented yet for GLES2."; | ||
| return false; | ||
| } | ||
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| GLuint read_fbo = GL_NONE; | ||
| GLuint draw_fbo = GL_NONE; | ||
| fml::ScopedCleanupClosure delete_fbos([&gl, &read_fbo, &draw_fbo]() { | ||
| DeleteFBO(gl, read_fbo, GL_READ_FRAMEBUFFER); | ||
| DeleteFBO(gl, draw_fbo, GL_DRAW_FRAMEBUFFER); | ||
| }); | ||
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| { | ||
| auto read = ConfigureFBO(gl, source, GL_READ_FRAMEBUFFER); | ||
| if (!read.has_value()) { | ||
| return false; | ||
| } | ||
| read_fbo = read.value(); | ||
| } | ||
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| { | ||
| auto draw = ConfigureFBO(gl, destination, GL_DRAW_FRAMEBUFFER); | ||
| if (!draw.has_value()) { | ||
| return false; | ||
| } | ||
| draw_fbo = draw.value(); | ||
| } | ||
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| gl.Disable(GL_SCISSOR_TEST); | ||
| gl.Disable(GL_DEPTH_TEST); | ||
| gl.Disable(GL_STENCIL_TEST); | ||
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| gl.BlitFramebuffer(source_region.origin.x, // srcX0 | ||
| source_region.origin.y, // srcY0 | ||
| source_region.size.width, // srcX1 | ||
| source_region.size.height, // srcY1 | ||
| destination_origin.x, // dstX0 | ||
| destination_origin.y, // dstY0 | ||
| source_region.size.width, // dstX1 | ||
| source_region.size.height, // dstY1 | ||
| GL_COLOR_BUFFER_BIT, // mask | ||
| GL_NEAREST // filter | ||
| ); | ||
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| return true; | ||
| }; | ||
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| BlitGenerateMipmapCommandGLES::~BlitGenerateMipmapCommandGLES() = default; | ||
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| std::string BlitGenerateMipmapCommandGLES::GetLabel() const { | ||
| return label; | ||
| } | ||
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| bool BlitGenerateMipmapCommandGLES::Encode(const ReactorGLES& reactor) const { | ||
| auto texture_gles = TextureGLES::Cast(texture.get()); | ||
| if (!texture_gles->GenerateMipmaps()) { | ||
| return false; | ||
| } | ||
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| return true; | ||
| }; | ||
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| } // namespace impeller |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
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| #pragma once | ||
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| #include "impeller/base/backend_cast.h" | ||
| #include "impeller/renderer/backend/gles/reactor_gles.h" | ||
| #include "impeller/renderer/blit_command.h" | ||
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| namespace impeller { | ||
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| /// Mixin for dispatching GLES commands. | ||
| struct BlitEncodeGLES : BackendCast<BlitEncodeGLES, BlitCommand> { | ||
| virtual ~BlitEncodeGLES(); | ||
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| virtual std::string GetLabel() const = 0; | ||
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| [[nodiscard]] virtual bool Encode(const ReactorGLES& reactor) const = 0; | ||
| }; | ||
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| struct BlitCopyTextureToTextureCommandGLES | ||
| : public BlitEncodeGLES, | ||
| public BlitCopyTextureToTextureCommand { | ||
| ~BlitCopyTextureToTextureCommandGLES() override; | ||
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| std::string GetLabel() const override; | ||
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| [[nodiscard]] bool Encode(const ReactorGLES& reactor) const override; | ||
| }; | ||
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| struct BlitGenerateMipmapCommandGLES : public BlitEncodeGLES, | ||
| public BlitGenerateMipmapCommand { | ||
| ~BlitGenerateMipmapCommandGLES() override; | ||
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| std::string GetLabel() const override; | ||
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| [[nodiscard]] bool Encode(const ReactorGLES& reactor) const override; | ||
| }; | ||
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| } // namespace impeller |
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