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LibGL: Implement glScissor()

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This commit is contained in:
Jelle Raaijmakers 2021-11-27 19:00:16 +01:00 committed by Brian Gianforcaro
parent 6dd2ebfe8e
commit bb58f6ccab
Notes: sideshowbarker 2024-07-18 00:35:33 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/bb58f6ccabc
Pull-request: https://github.com/SerenityOS/serenity/pull/11103
Reviewed-by: https://github.com/sunverwerth ✅
9 changed files with 83 additions and 10 deletions
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8
Userland/Libraries/LibGL/DepthBuffer.cpp
View file

@ -33,4 +33,12 @@ void DepthBuffer::clear(float depth)
}
}
void DepthBuffer::clear(Gfx::IntRect bounds, float depth)
{
bounds.intersect({ 0, 0, m_size.width(), m_size.height() });
for (int y = bounds.top(); y <= bounds.bottom(); ++y)
for (int x = bounds.left(); x <= bounds.right(); ++x)
m_data[y * m_size.width() + x] = depth;
}
}

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

@ -6,6 +6,7 @@
#pragma once
#include <LibGfx/Rect.h>
#include <LibGfx/Size.h>
namespace GL {
@ -18,6 +19,7 @@ public:
float* scanline(int y);
void clear(float depth);
void clear(Gfx::IntRect bounds, float depth);
private:
Gfx::IntSize m_size;

5
Userland/Libraries/LibGL/GL/gl.h
View file

@ -290,6 +290,10 @@ extern "C" {
#define GL_FOG_COLOR 0x0B66
#define GL_FOG_DENSITY 0x0B62
// Scissor enums
#define GL_SCISSOR_BOX 0x0C10
#define GL_SCISSOR_TEST 0x0C11
// OpenGL State & GLGet
#define GL_MODELVIEW_MATRIX 0x0BA6
@ -416,6 +420,7 @@ GLAPI void glFogfv(GLenum mode, GLfloat* params);
GLAPI void glFogf(GLenum pname, GLfloat param);
GLAPI void glFogi(GLenum pname, GLint param);
GLAPI void glPixelStorei(GLenum pname, GLint param);
GLAPI void glScissor(GLint x, GLint y, GLsizei width, GLsizei height);
#ifdef __cplusplus
}

1
Userland/Libraries/LibGL/GLContext.h
View file

@ -86,6 +86,7 @@ public:
virtual void gl_fogf(GLenum pname, GLfloat params) = 0;
virtual void gl_fogi(GLenum pname, GLint param) = 0;
virtual void gl_pixel_store(GLenum pname, GLfloat param) = 0;
virtual void gl_scissor(GLint x, GLint y, GLsizei width, GLsizei height) = 0;
virtual void present() = 0;
};

5
Userland/Libraries/LibGL/GLUtils.cpp
View file

@ -154,3 +154,8 @@ void glPixelStorei(GLenum pname, GLint param)
{
g_gl_context->gl_pixel_store(pname, param);
}
void glScissor(GLint x, GLint y, GLsizei width, GLsizei height)
{
g_gl_context->gl_scissor(x, y, width, height);
}

28
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -549,6 +549,10 @@ void SoftwareGLContext::gl_enable(GLenum capability)
rasterizer_options.fog_enabled = true;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = true;
update_rasterizer_options = true;
break;
default:
RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
}
@ -589,6 +593,10 @@ void SoftwareGLContext::gl_disable(GLenum capability)
rasterizer_options.fog_enabled = false;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = false;
update_rasterizer_options = true;
break;
default:
RETURN_WITH_ERROR_IF(true, GL_INVALID_ENUM);
}
@ -614,6 +622,8 @@ GLboolean SoftwareGLContext::gl_is_enabled(GLenum capability)
return m_alpha_test_enabled;
case GL_FOG:
return rasterizer_options.fog_enabled;
case GL_SCISSOR_TEST:
return rasterizer_options.scissor_enabled;
}
RETURN_VALUE_WITH_ERROR_IF(true, GL_INVALID_ENUM, 0);
@ -1472,6 +1482,14 @@ void SoftwareGLContext::gl_get_integerv(GLenum pname, GLint* data)
case GL_MAX_TEXTURE_SIZE:
*data = 4096;
break;
case GL_SCISSOR_BOX: {
auto scissor_box = m_rasterizer.options().scissor_box;
*(data + 0) = scissor_box.x();
*(data + 1) = scissor_box.y();
*(data + 2) = scissor_box.width();
*(data + 3) = scissor_box.height();
break;
}
default:
// According to the Khronos docs, we always return GL_INVALID_ENUM if we encounter a non-accepted value
// for `pname`
@ -1966,6 +1984,16 @@ void SoftwareGLContext::gl_pixel_store(GLenum pname, GLfloat param)
}
}
void SoftwareGLContext::gl_scissor(GLint x, GLint y, GLsizei width, GLsizei height)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_scissor, x, y, width, height);
RETURN_WITH_ERROR_IF(width < 0 || height < 0, GL_INVALID_VALUE);
auto options = m_rasterizer.options();
options.scissor_box = { x, y, width, height };
m_rasterizer.set_options(options);
}
void SoftwareGLContext::present()
{
m_rasterizer.blit_to(*m_frontbuffer);

5
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -20,6 +20,7 @@
#include <AK/Vector.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Matrix4x4.h>
#include <LibGfx/Rect.h>
#include <LibGfx/Vector3.h>
namespace GL {
@ -96,6 +97,7 @@ public:
virtual void gl_fogf(GLenum pname, GLfloat param) override;
virtual void gl_fogi(GLenum pname, GLint param) override;
virtual void gl_pixel_store(GLenum pname, GLfloat param) override;
virtual void gl_scissor(GLint x, GLint y, GLsizei width, GLsizei height);
virtual void present() override;
private:
@ -231,7 +233,8 @@ private:
decltype(&SoftwareGLContext::gl_draw_arrays),
decltype(&SoftwareGLContext::gl_draw_elements),
decltype(&SoftwareGLContext::gl_depth_range),
decltype(&SoftwareGLContext::gl_polygon_offset)>;
decltype(&SoftwareGLContext::gl_polygon_offset),
decltype(&SoftwareGLContext::gl_scissor)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;

36
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
View file

@ -183,11 +183,15 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
};
// Calculate block-based bounds
auto render_bounds = render_target.rect();
if (options.scissor_enabled)
render_bounds.intersect(options.scissor_box);
int const block_padding = RASTERIZER_BLOCK_SIZE - 1;
// clang-format off
const int bx0 = max(0, min(min(v0.x(), v1.x()), v2.x()) ) / RASTERIZER_BLOCK_SIZE;
const int bx1 = min(render_target.width(), max(max(v0.x(), v1.x()), v2.x()) + RASTERIZER_BLOCK_SIZE - 1) / RASTERIZER_BLOCK_SIZE;
const int by0 = max(0, min(min(v0.y(), v1.y()), v2.y()) ) / RASTERIZER_BLOCK_SIZE;
const int by1 = min(render_target.height(), max(max(v0.y(), v1.y()), v2.y()) + RASTERIZER_BLOCK_SIZE - 1) / RASTERIZER_BLOCK_SIZE;
int const bx0 = max(render_bounds.left(), min(min(v0.x(), v1.x()), v2.x())) / RASTERIZER_BLOCK_SIZE;
int const bx1 = (min(render_bounds.right(), max(max(v0.x(), v1.x()), v2.x())) + block_padding) / RASTERIZER_BLOCK_SIZE;
int const by0 = max(render_bounds.top(), min(min(v0.y(), v1.y()), v2.y())) / RASTERIZER_BLOCK_SIZE;
int const by1 = (min(render_bounds.bottom(), max(max(v0.y(), v1.y()), v2.y())) + block_padding) / RASTERIZER_BLOCK_SIZE;
// clang-format on
static_assert(RASTERIZER_BLOCK_SIZE < sizeof(int) * 8, "RASTERIZER_BLOCK_SIZE must be smaller than the pixel_mask's width in bits");
@ -229,11 +233,10 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
int y0 = by * RASTERIZER_BLOCK_SIZE;
// Generate the coverage mask
if (test_point(b0) && test_point(b1) && test_point(b2) && test_point(b3)) {
if (!options.scissor_enabled && test_point(b0) && test_point(b1) && test_point(b2) && test_point(b3)) {
// The block is fully contained within the triangle. Fill the mask with all 1s
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++)
pixel_mask[y] = -1;
}
} else {
// The block overlaps at least one triangle edge.
// We need to test coverage of every pixel within the block.
@ -242,7 +245,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
pixel_mask[y] = 0;
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, coords += dbdx) {
if (test_point(coords))
if (test_point(coords) && (!options.scissor_enabled || render_bounds.contains(x0 + x, y0 + y)))
pixel_mask[y] |= 1 << x;
}
}
@ -481,6 +484,7 @@ SoftwareRasterizer::SoftwareRasterizer(const Gfx::IntSize& min_size)
: m_render_target { Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, closest_multiple(min_size, RASTERIZER_BLOCK_SIZE)).release_value_but_fixme_should_propagate_errors() }
, m_depth_buffer { adopt_own(*new DepthBuffer(closest_multiple(min_size, RASTERIZER_BLOCK_SIZE))) }
{
m_options.scissor_box = m_render_target->rect();
}
void SoftwareRasterizer::submit_triangle(const GLTriangle& triangle, const Array<TextureUnit, 32>& texture_units)
@ -559,14 +563,28 @@ void SoftwareRasterizer::clear_color(const FloatVector4& color)
uint8_t g = static_cast<uint8_t>(clamp(color.y(), 0.0f, 1.0f) * 255);
uint8_t b = static_cast<uint8_t>(clamp(color.z(), 0.0f, 1.0f) * 255);
uint8_t a = static_cast<uint8_t>(clamp(color.w(), 0.0f, 1.0f) * 255);
auto const fill_color = Gfx::Color(r, g, b, a);
m_render_target->fill(Gfx::Color(r, g, b, a));
if (m_options.scissor_enabled) {
auto fill_rect = m_render_target->rect();
fill_rect.intersect(m_options.scissor_box);
Gfx::Painter painter { *m_render_target };
painter.fill_rect(fill_rect, fill_color);
return;
}
m_render_target->fill(fill_color);
}
void SoftwareRasterizer::clear_depth(float depth)
{
wait_for_all_threads();
if (m_options.scissor_enabled) {
m_depth_buffer->clear(m_options.scissor_box, depth);
return;
}
m_depth_buffer->clear(depth);
}

3
Userland/Libraries/LibGL/SoftwareRasterizer.h
View file

@ -14,6 +14,7 @@
#include <AK/Array.h>
#include <AK/OwnPtr.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Rect.h>
#include <LibGfx/Vector4.h>
namespace GL {
@ -44,6 +45,8 @@ struct RasterizerOptions {
GLboolean fog_enabled { false };
GLfloat fog_start { 0.0f };
GLfloat fog_end { 1.0f };
bool scissor_enabled { false };
Gfx::IntRect scissor_box {};
GLenum draw_buffer { GL_BACK };
GLfloat depth_offset_factor { 0 };
GLfloat depth_offset_constant { 0 };