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LibGL: Implement glDepthRange

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This commit is contained in:
Stephan Unverwerth 2021-08-16 17:52:12 +02:00 • committed by Andreas Kling
parent 3dd9efd35f
commit a97dbd2317
7 changed files with 26 additions and 1 deletions
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1
Userland/Libraries/LibGL/GL/gl.h
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@ -369,6 +369,7 @@ GLAPI void glColorPointer(GLint size, GLenum type, GLsizei stride, const void* p
GLAPI void glTexCoordPointer(GLint size, GLenum type, GLsizei stride, const void* pointer);
GLAPI void glDrawArrays(GLenum mode, GLint first, GLsizei count);
GLAPI void glDrawElements(GLenum mode, GLsizei count, GLenum type, const void* indices);
GLAPI void glDepthRange(GLdouble nearVal, GLdouble farVal);
#ifdef __cplusplus
}

1
Userland/Libraries/LibGL/GLContext.h
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@ -74,6 +74,7 @@ public:
virtual void gl_color_mask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha) = 0;
virtual void gl_get_booleanv(GLenum pname, GLboolean* data) = 0;
virtual void gl_get_integerv(GLenum pname, GLint* data) = 0;
virtual void gl_depth_range(GLdouble min, GLdouble max) = 0;
virtual void present() = 0;
};

5
Userland/Libraries/LibGL/GLUtils.cpp
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@ -119,3 +119,8 @@ void glDisableClientState(GLenum cap)
{
g_gl_context->gl_disable_client_state(cap);
}
void glDepthRange(GLdouble min, GLdouble max)
{
g_gl_context->gl_depth_range(min, max);
}

12
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -1641,6 +1641,18 @@ void SoftwareGLContext::gl_draw_elements(GLenum mode, GLsizei count, GLenum type
glEnd();
}
void SoftwareGLContext::gl_depth_range(GLdouble min, GLdouble max)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_depth_range, min, max);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
auto options = m_rasterizer.options();
options.depth_min = clamp(min, 0.f, 1.f);
options.depth_max = clamp(max, 0.f, 1.f);
m_rasterizer.set_options(options);
}
// General helper function to read arbitrary vertex attribute data into a float array
void SoftwareGLContext::read_from_vertex_attribute_pointer(VertexAttribPointer const& attrib, int index, float* elements, bool normalize)
{

4
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -84,6 +84,7 @@ public:
virtual void gl_color_mask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha) override;
virtual void gl_get_booleanv(GLenum pname, GLboolean* data) override;
virtual void gl_get_integerv(GLenum pname, GLint* data) override;
virtual void gl_depth_range(GLdouble min, GLdouble max) override;
virtual void present() override;
private:
@ -215,7 +216,8 @@ private:
decltype(&SoftwareGLContext::gl_tex_parameter),
decltype(&SoftwareGLContext::gl_depth_mask),
decltype(&SoftwareGLContext::gl_draw_arrays),
decltype(&SoftwareGLContext::gl_draw_elements)>;
decltype(&SoftwareGLContext::gl_draw_elements),
decltype(&SoftwareGLContext::gl_depth_range)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;

2
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
View file

@ -260,6 +260,8 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
auto barycentric = FloatVector3(coords.x(), coords.y(), coords.z()) * one_over_area;
float z = interpolate(triangle.vertices[0].z, triangle.vertices[1].z, triangle.vertices[2].z, barycentric);
z = options.depth_min + (options.depth_max - options.depth_min) * (z + 1) / 2;
if (z >= *depth) {
pixel_mask[y] ^= 1 << x;
continue;

2
Userland/Libraries/LibGL/SoftwareRasterizer.h
View file

@ -29,6 +29,8 @@ struct RasterizerOptions {
GLenum blend_source_factor { GL_ONE };
GLenum blend_destination_factor { GL_ONE };
u32 color_mask { 0xffffffff };
float depth_min { 0 };
float depth_max { 1 };
};
class SoftwareRasterizer final {