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FREESCAPE: perspective correction in drawEclipse

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This commit is contained in:
neuromancer 2024-03-30 12:37:33 +01:00
parent b9e39e80e1
commit a9026919d4
3 changed files with 7 additions and 5 deletions
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4
engines/freescape/gfx.cpp
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@ -1002,9 +1002,9 @@ void Renderer::drawBackground(uint8 color) {
void Renderer::drawEclipse(byte color1, byte color2, float progress) {
Math::Vector3d sunPosition(-5000, 1200, 0);
float radius = 500.0;
float radius = 400.0;
drawCelestialBody(sunPosition, radius, color1);
Math::Vector3d moonPosition(-5000, 1200, 0 + 500 * progress);
Math::Vector3d moonPosition(-5000, 1200, 800 * progress);
drawCelestialBody(moonPosition, radius, color2);
}

5
engines/freescape/gfx_opengl.cpp
View File

@ -314,11 +314,12 @@ void OpenGLRenderer::drawCelestialBody(Math::Vector3d position, float radius, by
glEnableClientState(GL_VERTEX_ARRAY);
copyToVertexArray(0, position);
float adj = 1.25; // Perspective correction
for(int i = 0; i <= triangleAmount; i++) {
copyToVertexArray(i + 1,
Math::Vector3d(position.x(), position.y() + (radius * cos(i * twicePi / triangleAmount)),
position.z() + (radius * sin(i * twicePi / triangleAmount)))
position.z() + (adj * radius * sin(i * twicePi / triangleAmount)))
);
}
@ -336,7 +337,7 @@ void OpenGLRenderer::drawCelestialBody(Math::Vector3d position, float radius, by
for(int i = 0; i <= triangleAmount; i++) {
copyToVertexArray(i + 1,
Math::Vector3d(position.x(), position.y() + (radius * cos(i * twicePi / triangleAmount)),
position.z() + (radius * sin(i * twicePi / triangleAmount)))
position.z() + (adj * radius * sin(i * twicePi / triangleAmount)))
);
}

3
engines/freescape/gfx_opengl_shaders.cpp
View File

@ -304,6 +304,7 @@ void OpenGLShaderRenderer::drawCelestialBody(Math::Vector3d position, float radi
int triangleAmount = 20;
float twicePi = (float)(2.0 * M_PI);
float adj = 1.25; // Perspective correction
// Quick billboard effect inspired from this code:
// http://www.lighthouse3d.com/opengl/billboarding/index.php?billCheat
@ -332,7 +333,7 @@ void OpenGLShaderRenderer::drawCelestialBody(Math::Vector3d position, float radi
for(int i = 0; i <= triangleAmount; i++) {
float x = position.x();
float y = position.y() + (radius * cos(i * twicePi / triangleAmount));
float z = position.z() + (radius * sin(i * twicePi / triangleAmount));
float z = position.z() + (adj * radius * sin(i * twicePi / triangleAmount));
copyToVertexArray(i + 1, Math::Vector3d(x, y, z));
}