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我想向着色器發送顏色,但顏色被交換, 我發送0xFF00FFFF(洋紅色),但我在着色器中得到0xFFFF00FF(黃色)。OpenGL - 着色器中的頂點顏色被交換
我認爲正在發生的事情是這樣的,通過實驗:
我的頂點着色器:
#version 330 core
layout(location = 0) in vec4 position;
layout(location = 1) in vec3 normal;
layout(location = 2) in vec4 color;
uniform mat4 pr_matrix;
uniform mat4 vw_matrix = mat4(1.0);
uniform mat4 ml_matrix = mat4(1.0);
out DATA
{
vec4 position;
vec3 normal;
vec4 color;
} vs_out;
void main()
{
gl_Position = pr_matrix * vw_matrix * ml_matrix * position;
vs_out.position = position;
vs_out.color = color;
vs_out.normal = normalize(mat3(ml_matrix) * normal);
}
而片段着色器:
#version 330 core
layout(location = 0) out vec4 out_color;
in DATA
{
vec3 position;
vec3 normal;
vec4 color;
} fs_in;
void main()
{
out_color = fs_in.color;
//out_color = vec4(fs_in.color.y, 0, 0, 1);
//out_color = vec4((fs_in.normal + 1/2.0), 1.0);
}
這裏是如何我設置了網格:
struct Vertex_Color {
Vec3 vertex;
Vec3 normal;
GLint color; // GLuint tested
};
std::vector<Vertex_Color> verts = std::vector<Vertex_Color>();
[loops]
int color = 0xFF00FFFF; // magenta, uint tested
verts.push_back({ vert, normal, color });
glBufferData(GL_ARRAY_BUFFER, verts.size() * sizeof(Vertex_Color), &verts[0], GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex_Color), (const GLvoid*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex_Color), (const GLvoid*)(offsetof(Vertex_Color, normal)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(Vertex_Color), (const GLvoid*)(offsetof(Vertex_Color, color)));
glEnableVertexAttribArray(2);
下面是一些例子:
我無法弄清楚什麼是錯的。提前致謝。
謝謝,你說的對,我會用Vec4的顏色。 – Dementor