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LibGL: Don't repeat ourselves in read_from_vertex_attribute_pointer

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Jelle Raaijmakers 2022-10-16 16:52:27 +02:00 • committed by Linus Groh
parent 5def168f14
commit e2b151812e
1 changed files with 28 additions and 76 deletions
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104
Userland/Libraries/LibGL/Vertex.cpp
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@ -8,6 +8,7 @@
#include <AK/Assertions.h>
#include <AK/Debug.h>
#include <AK/NumericLimits.h>
#include <LibGL/GLContext.h>
namespace GL {
@ -16,93 +17,44 @@ namespace GL {
static void read_from_vertex_attribute_pointer(VertexAttribPointer const& attrib, int index, float* elements)
{
auto const* byte_ptr = reinterpret_cast<char const*>(attrib.pointer);
auto normalize = attrib.normalize;
size_t stride = attrib.stride;
auto read_values = [&]<typename T>() {
auto const stride = (attrib.stride == 0) ? sizeof(T) * attrib.size : attrib.stride;
for (int i = 0; i < attrib.size; ++i) {
elements[i] = *(reinterpret_cast<T const*>(byte_ptr + stride * index) + i);
if constexpr (IsIntegral<T>) {
if (attrib.normalize)
elements[i] /= NumericLimits<T>::max();
}
}
};
switch (attrib.type) {
case GL_BYTE: {
if (stride == 0)
stride = sizeof(GLbyte) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLbyte const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0x80;
}
case GL_BYTE:
read_values.operator()<GLbyte>();
break;
}
case GL_UNSIGNED_BYTE: {
if (stride == 0)
stride = sizeof(GLubyte) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLubyte const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0xff;
}
case GL_UNSIGNED_BYTE:
read_values.operator()<GLubyte>();
break;
}
case GL_SHORT: {
if (stride == 0)
stride = sizeof(GLshort) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLshort const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0x8000;
}
case GL_SHORT:
read_values.operator()<GLshort>();
break;
}
case GL_UNSIGNED_SHORT: {
if (stride == 0)
stride = sizeof(GLushort) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLushort const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0xffff;
}
case GL_UNSIGNED_SHORT:
read_values.operator()<GLushort>();
break;
}
case GL_INT: {
if (stride == 0)
stride = sizeof(GLint) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLint const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0x80000000;
}
case GL_INT:
read_values.operator()<GLint>();
break;
}
case GL_UNSIGNED_INT: {
if (stride == 0)
stride = sizeof(GLuint) * attrib.size;
for (int i = 0; i < attrib.size; i++) {
elements[i] = *(reinterpret_cast<GLuint const*>(byte_ptr + stride * index) + i);
if (normalize)
elements[i] /= 0xffffffff;
}
case GL_UNSIGNED_INT:
read_values.operator()<GLuint>();
break;
}
case GL_FLOAT: {
if (stride == 0)
stride = sizeof(GLfloat) * attrib.size;
for (int i = 0; i < attrib.size; i++)
elements[i] = *(reinterpret_cast<GLfloat const*>(byte_ptr + stride * index) + i);
case GL_FLOAT:
read_values.operator()<GLfloat>();
break;
}
case GL_DOUBLE: {
if (stride == 0)
stride = sizeof(GLdouble) * attrib.size;
for (int i = 0; i < attrib.size; i++)
elements[i] = static_cast<float>(*(reinterpret_cast<GLdouble const*>(byte_ptr + stride * index) + i));
case GL_DOUBLE:
read_values.operator()<GLdouble>();
break;
}
}
}
void GLContext::gl_array_element(GLint i)