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LibGL+LibSoftGPU: Implement viewport support

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This implements the `glViewport` API call, the coordinate
transformation and the `GL_VIEWPORT` context parameter.
This commit is contained in:
Jelle Raaijmakers 2022-01-08 14:43:03 +01:00 • committed by Linus Groh
parent d236b0ed12
commit 29bbf56286
4 changed files with 33 additions and 13 deletions
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25
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -56,7 +56,8 @@ static constexpr size_t TEXTURE_MATRIX_STACK_LIMIT = 8;
}
SoftwareGLContext::SoftwareGLContext(Gfx::Bitmap& frontbuffer)
: m_frontbuffer(frontbuffer)
: m_viewport(frontbuffer.rect())
, m_frontbuffer(frontbuffer)
, m_rasterizer(frontbuffer.size())
, m_device_info(m_rasterizer.info())
{
@ -159,6 +160,18 @@ Optional<ContextParameter> SoftwareGLContext::get_context_parameter(GLenum name)
return ContextParameter { .type = GL_INT, .value = { .integer_value = 0 } };
case GL_UNPACK_SWAP_BYTES:
return ContextParameter { .type = GL_BOOL, .value = { .boolean_value = false } };
case GL_VIEWPORT:
return ContextParameter {
.type = GL_INT,
.count = 4,
.value = {
.integer_list = {
m_viewport.x(),
m_viewport.y(),
m_viewport.width(),
m_viewport.height(),
} }
};
default:
dbgln_if(GL_DEBUG, "get_context_parameter({:#x}): unknown context parameter", name);
return {};
@ -577,11 +590,13 @@ void SoftwareGLContext::gl_viewport(GLint x, GLint y, GLsizei width, GLsizei hei
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_viewport, x, y, width, height);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(width < 0 || height < 0, GL_INVALID_VALUE);
(void)(x);
(void)(y);
(void)(width);
(void)(height);
m_viewport = { x, y, width, height };
auto rasterizer_options = m_rasterizer.options();
rasterizer_options.viewport = m_viewport;
m_rasterizer.set_options(rasterizer_options);
}
void SoftwareGLContext::gl_enable(GLenum capability)