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LibGL: Implement Texture State Management

Some very primitive Texture State management. Data can now be
uploaded to textures.
This commit is contained in:
Jesse Buhagiar 2021-05-13 22:18:17 +10:00 committed by Ali Mohammad Pur
parent 21dff6d40b
commit 4f324ba4d7
8 changed files with 309 additions and 0 deletions

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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <LibGL/GL/gl.h>
#include <LibGL/Tex/Texture.h>
#include <string.h>
namespace GL {
void Texture::upload_texture_data(GLenum, GLint lod, GLint internal_format, GLsizei width, GLsizei height, GLint, GLenum format, GLenum, const GLvoid* pixels)
{
// NOTE: Some target, format, and internal formats are currently unsupported.
// Considering we control this library, and `gl.h` itself, we don't need to add any
// checks here to see if we support them; the program will simply fail to compile..
// Somebody passed us in nullptr...
// Apparently this allocates memory on the GPU (according to Khronos docs..)?
if (pixels == nullptr) {
dbgln("LibGL: pixels == nullptr when uploading texture data.");
VERIFY_NOT_REACHED();
}
m_internal_format = internal_format;
// Get reference to the mip
auto& mip = m_mipmaps[lod];
const u8* pixel_byte_array = reinterpret_cast<const u8*>(pixels);
// Copy pixel data to storage
// Pixels are already 32-bits wide
if (format == GL_RGBA || format == GL_BGRA) {
mip.pixel_data().resize(width * height * sizeof(u32));
memcpy(mip.pixel_data().data(), pixels, width * height * sizeof(u32));
} else {
mip.pixel_data().resize(width * height * 3);
// Copy RGB or BGR pixel data
for (auto i = 0; i < width * height * 3; i += 3) {
u32 b0 = pixel_byte_array[i]; // B or R
u32 b1 = pixel_byte_array[i + 1]; // G
u32 b2 = pixel_byte_array[i + 2]; // R or B
u32 pixel = ((0xffu << 24) | (b0 << 16) | (b1 << 8) | b2);
mip.pixel_data().append(pixel);
}
}
// Now we need to swizzle the texture data from `format` to `internal_format`
switch (format) {
case GL_BGR: {
if (internal_format == GL_RGB) {
swizzle(mip.pixel_data(), [](u32 pixel) -> u32 {
u8 r = pixel & 0xff;
u8 g = (pixel >> 8) & 0xff;
u8 b = (pixel >> 16) & 0xff;
return (0xff << 24) | (r << 16) | (g << 8) | b;
});
} else if (internal_format == GL_RGBA) {
swizzle(mip.pixel_data(), [](u32 pixel) -> u32 {
u8 r = pixel & 0xff;
u8 g = (pixel >> 8) & 0xff;
u8 b = (pixel >> 16) & 0xff;
return (r << 24) | (g << 16) | (b << 8) | 0xff;
});
}
} break;
case GL_BGRA: {
if (internal_format == GL_RGB) {
swizzle(mip.pixel_data(), [](u32 pixel) -> u32 {
u8 r = (pixel >> 8) & 0xff;
u8 g = (pixel >> 16) & 0xff;
u8 b = (pixel >> 24) & 0xff;
return (0xff << 24) | (r << 16) | (g << 8) | b;
});
} else if (internal_format == GL_RGBA) {
swizzle(mip.pixel_data(), [](u32 pixel) -> u32 {
u8 a = pixel & 0xff;
u8 r = (pixel >> 8) & 0xff;
u8 g = (pixel >> 16) & 0xff;
u8 b = (pixel >> 24) & 0xff;
return (r << 24) | (g << 16) | (b << 8) | a;
});
}
} break;
case GL_RGB: {
if (internal_format == GL_RGBA) {
swizzle(mip.pixel_data(), [](u32 pixel) -> u32 {
u8 r = pixel & 0xff;
u8 g = (pixel >> 8) & 0xff;
u8 b = (pixel >> 16) & 0xff;
return (r << 24) | (g << 16) | (b << 8) | 0xff;
});
}
} break;
case GL_RGBA:
break;
default:
// Let's crash for now so we can implement format by format
VERIFY_NOT_REACHED();
}
mip.set_width(width);
mip.set_height(height);
}
FloatVector4 Texture::sample_texel(const FloatVector2& uv) const
{
auto& mip = m_mipmaps.at(0);
// FIXME: Remove this to prevent a crash when we have proper texture binding
if (mip.width() == 0 || mip.height() == 0)
return { 1.0f, 1.0f, 1.0f, 1.0f };
u32 u = static_cast<u32>(uv.x() * mip.width());
u32 v = static_cast<u32>(uv.y() * mip.height());
u32 pixel = mip.pixel_data().at(v * mip.width() + u);
float b0 = ((pixel)&0xff) / 255.0f;
float b1 = ((pixel >> 8) & 0xff) / 255.0f;
float b2 = ((pixel >> 16) & 0xff) / 255.0f;
return { b0, b1, b2, 1.0f };
}
}

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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Array.h>
#include <AK/RefCounted.h>
#include <AK/Vector.h>
#include <LibGL/GL/gl.h>
#include <LibGfx/Vector2.h>
#include <LibGfx/Vector4.h>
namespace GL {
class Texture final : public RefCounted<Texture> {
public:
// FIXME: These shouldn't really belong here, they're context specific.
static constexpr u16 MAX_TEXTURE_SIZE = 2048;
static constexpr u8 LOG2_MAX_TEXTURE_SIZE = 11;
class MipMap {
public:
MipMap() = default;
~MipMap() = default;
void set_width(GLsizei width) { m_width = width; }
void set_height(GLsizei height) { m_height = height; }
GLsizei width() const { return m_width; }
GLsizei height() const { return m_height; }
Vector<u32>& pixel_data() { return m_pixel_data; }
const Vector<u32>& pixel_data() const { return m_pixel_data; }
private:
GLsizei m_width;
GLsizei m_height;
Vector<u32> m_pixel_data;
};
// To quote the Khronos documentation:
// "You could say that a texture object contains a sampler object, which you access through the texture interface."
// FIXME: Better name?
struct TextureSamplerParamaters {
GLint m_min_filter { GL_NEAREST_MIPMAP_LINEAR };
GLint m_mag_filter { GL_LINEAR };
GLint m_wrap_s_mode { GL_REPEAT };
GLint m_wrap_t_mode { GL_REPEAT };
};
public:
Texture() = default;
~Texture() { }
void upload_texture_data(GLenum target, GLint lod, GLint internal_format, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* pixels);
void replace_sub_texture_data(GLint lod, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid* data);
FloatVector4 sample_texel(const FloatVector2& uv) const;
GLenum internal_format() const { return m_internal_format; }
private:
template<typename TCallback>
void swizzle(Vector<u32>& pixels, TCallback&& callback)
{
for (auto& pixel : pixels)
pixel = callback(pixel);
}
private:
// FIXME: Mipmaps are currently unused, but we have the plumbing for it at least
Array<MipMap, LOG2_MAX_TEXTURE_SIZE> m_mipmaps;
GLenum m_internal_format;
TextureSamplerParamaters m_sampler_params;
};
}