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Use blend gate plan for canvas copy decisions

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This commit is contained in:
omigamedev
2026-06-03 18:37:58 +02:00
parent bc5b39057d
commit b576143afb
7 changed files with 73 additions and 19 deletions
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22
src/canvas.cpp
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@@ -49,7 +49,7 @@ pp::renderer::RenderDeviceFeatures canvas_stroke_composite_features() noexcept
return ShaderManager::render_device_features();
}
bool draw_merge_needs_shader_blend(
pp::paint_renderer::CanvasBlendGatePlan draw_merge_blend_gate_plan(
int width,
int height,
const std::vector<std::shared_ptr<Layer>>& layers,
@@ -75,7 +75,15 @@ bool draw_merge_needs_shader_blend(
.has_stroke_blend_mode = brush != nullptr,
.stroke_blend_mode = brush ? brush->m_blend_mode : 0,
});
return plan ? plan.value().shader_blend : true;
if (plan) {
return plan.value();
}
pp::paint_renderer::CanvasBlendGatePlan fallback;
fallback.shader_blend = true;
fallback.complex_blend = true;
fallback.compatibility_fallback = true;
return fallback;
}
GLenum unsigned_byte_component_type()
@@ -1121,11 +1129,13 @@ void Canvas::draw_merge(bool draw_checkerboard, std::array<bool, 6> faces /*= SI
auto ortho = glm::ortho<float>(-0.5f, 0.5f, -0.5f, 0.5f, -1.f, 1.f);
const auto& b = m_current_stroke->m_brush;
const bool use_blend = draw_merge_needs_shader_blend(
const auto blend_gate = draw_merge_blend_gate_plan(
m_width,
m_height,
m_layers,
m_current_stroke ? m_current_stroke->m_brush.get() : nullptr);
const bool use_blend = blend_gate.shader_blend;
const bool copy_blend_destination = use_blend && !blend_gate.reads_destination_color;
// if not using shader blend, use gl rasterizer blend
glDisable(depth_test_state());
@@ -1289,7 +1299,7 @@ void Canvas::draw_merge(bool draw_checkerboard, std::array<bool, 6> faces /*= SI
ShaderManager::u_int(kShaderUniform::BlendMode, m_layers[layer_index]->m_blend_mode);
ShaderManager::u_float(kShaderUniform::Alpha, 1.f);
ShaderManager::u_mat4(kShaderUniform::MVP, ortho);
if (!ShaderManager::ext_framebuffer_fetch)
if (copy_blend_destination)
{
m_sampler.bind(2);
ShaderManager::u_int(kShaderUniform::TexBG, 2);
@@ -1297,7 +1307,7 @@ void Canvas::draw_merge(bool draw_checkerboard, std::array<bool, 6> faces /*= SI
set_active_texture_unit(0);
m_merge_rtt.bindTexture();
if (!ShaderManager::ext_framebuffer_fetch)
if (copy_blend_destination)
{
set_active_texture_unit(2);
m_merge_tex.bind();
@@ -1306,7 +1316,7 @@ void Canvas::draw_merge(bool draw_checkerboard, std::array<bool, 6> faces /*= SI
m_plane.draw_fill();
if (!ShaderManager::ext_framebuffer_fetch)
if (copy_blend_destination)
{
set_active_texture_unit(2);
m_merge_tex.unbind();