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LibGL: Always normalize vertex attribute data

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We were normalizing data read from vertex attribute pointers based on
their usage, but there is nothing written about this behavior in the
spec or in man pages.

When we implement `glVertexAttribPointer` however, the user can
optionally enable normalization per vertex attribute pointer. This
refactors the `VertexAttribPointer` to have a `normalize` field so we
can support that future implementation.
This commit is contained in:
Jelle Raaijmakers 2022-03-23 12:36:53 +01:00 committed by Brian Gianforcaro
parent bc5e5afc7b
commit 74de8e4224
Notes: sideshowbarker 2024-07-17 16:40:16 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/74de8e4224
Pull-request: https://github.com/SerenityOS/serenity/pull/13209
Reviewed-by: https://github.com/Quaker762 ✅
Reviewed-by: https://github.com/sunverwerth ✅
2 changed files with 12 additions and 10 deletions
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19
Userland/Libraries/LibGL/GLContext.cpp
View file

@ -2101,26 +2101,26 @@ void GLContext::gl_draw_arrays(GLenum mode, GLint first, GLsizei count)
for (int i = first; i < last; i++) {
if (m_client_side_color_array_enabled) {
float color[4] { 0, 0, 0, 1 };
read_from_vertex_attribute_pointer(m_client_color_pointer, i, color, true);
read_from_vertex_attribute_pointer(m_client_color_pointer, i, color);
gl_color(color[0], color[1], color[2], color[3]);
}
for (size_t t = 0; t < m_client_tex_coord_pointer.size(); ++t) {
if (m_client_side_texture_coord_array_enabled[t]) {
float tex_coords[4] { 0, 0, 0, 0 };
read_from_vertex_attribute_pointer(m_client_tex_coord_pointer[t], i, tex_coords, false);
read_from_vertex_attribute_pointer(m_client_tex_coord_pointer[t], i, tex_coords);
gl_multi_tex_coord(GL_TEXTURE0 + t, tex_coords[0], tex_coords[1], tex_coords[2], tex_coords[3]);
}
}
if (m_client_side_normal_array_enabled) {
float normal[3];
read_from_vertex_attribute_pointer(m_client_normal_pointer, i, normal, false);
read_from_vertex_attribute_pointer(m_client_normal_pointer, i, normal);
gl_normal(normal[0], normal[1], normal[2]);
}
float vertex[4] { 0, 0, 0, 1 };
read_from_vertex_attribute_pointer(m_client_vertex_pointer, i, vertex, false);
read_from_vertex_attribute_pointer(m_client_vertex_pointer, i, vertex);
gl_vertex(vertex[0], vertex[1], vertex[2], vertex[3]);
}
gl_end();
@ -2168,26 +2168,26 @@ void GLContext::gl_draw_elements(GLenum mode, GLsizei count, GLenum type, const
if (m_client_side_color_array_enabled) {
float color[4] { 0, 0, 0, 1 };
read_from_vertex_attribute_pointer(m_client_color_pointer, i, color, true);
read_from_vertex_attribute_pointer(m_client_color_pointer, i, color);
gl_color(color[0], color[1], color[2], color[3]);
}
for (size_t t = 0; t < m_client_tex_coord_pointer.size(); ++t) {
if (m_client_side_texture_coord_array_enabled[t]) {
float tex_coords[4] { 0, 0, 0, 0 };
read_from_vertex_attribute_pointer(m_client_tex_coord_pointer[t], i, tex_coords, false);
read_from_vertex_attribute_pointer(m_client_tex_coord_pointer[t], i, tex_coords);
gl_multi_tex_coord(GL_TEXTURE0 + t, tex_coords[0], tex_coords[1], tex_coords[2], tex_coords[3]);
}
}
if (m_client_side_normal_array_enabled) {
float normal[3];
read_from_vertex_attribute_pointer(m_client_normal_pointer, i, normal, false);
read_from_vertex_attribute_pointer(m_client_normal_pointer, i, normal);
gl_normal(normal[0], normal[1], normal[2]);
}
float vertex[4] { 0, 0, 0, 1 };
read_from_vertex_attribute_pointer(m_client_vertex_pointer, i, vertex, false);
read_from_vertex_attribute_pointer(m_client_vertex_pointer, i, vertex);
gl_vertex(vertex[0], vertex[1], vertex[2], vertex[3]);
}
gl_end();
@ -2342,9 +2342,10 @@ void GLContext::gl_depth_func(GLenum func)
}
// General helper function to read arbitrary vertex attribute data into a float array
void GLContext::read_from_vertex_attribute_pointer(VertexAttribPointer const& attrib, int index, float* elements, bool normalize)
void GLContext::read_from_vertex_attribute_pointer(VertexAttribPointer const& attrib, int index, float* elements)
{
auto byte_ptr = reinterpret_cast<const char*>(attrib.pointer);
auto normalize = attrib.normalize;
size_t stride = attrib.stride;
switch (attrib.type) {

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

@ -417,11 +417,12 @@ private:
struct VertexAttribPointer {
GLint size { 4 };
GLenum type { GL_FLOAT };
bool normalize { true };
GLsizei stride { 0 };
const void* pointer { 0 };
};
static void read_from_vertex_attribute_pointer(VertexAttribPointer const&, int index, float* elements, bool normalize);
static void read_from_vertex_attribute_pointer(VertexAttribPointer const&, int index, float* elements);
VertexAttribPointer m_client_vertex_pointer;
VertexAttribPointer m_client_color_pointer;