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Sprite: Implement wave effect (RGSS2)

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This initial implementation emulates the way RMVX splits
the sprite into "chunks" of about 8 pixels, which it then
scrolls left/right on a vertical sine wave. It even
replicates the weird behavior when wave_amp < 0, namely
"shrinking" the src_rect horizontally.

As with bush_opacity, this effect in combination with
rotation will render differently from RMVX.
This commit is contained in:
Jonas Kulla 2014-02-03 15:32:50 +01:00
parent 42b10fd2ee
commit af9039f58d
6 changed files with 346 additions and 21 deletions

74
src/quadarray.h
View file

@ -34,17 +34,41 @@
typedef uint32_t index_t;
#define _GL_INDEX_TYPE GL_UNSIGNED_INT
struct ColorQuadArray
/* A small hack to get mutable QuadArray constructors */
inline void initBufferBindings(Vertex *)
{
std::vector<Vertex> vertices;
glEnableVertexAttribArray(Shader::Color);
glEnableVertexAttribArray(Shader::Position);
glEnableVertexAttribArray(Shader::TexCoord);
glVertexAttribPointer(Shader::Color, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::colorOffset());
glVertexAttribPointer(Shader::Position, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::posOffset());
glVertexAttribPointer(Shader::TexCoord, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::texPosOffset());
}
inline void initBufferBindings(SVertex *)
{
glEnableVertexAttribArray(Shader::Position);
glEnableVertexAttribArray(Shader::TexCoord);
glVertexAttribPointer(Shader::Position, 2, GL_FLOAT, GL_FALSE, sizeof(SVertex), SVertex::posOffset());
glVertexAttribPointer(Shader::TexCoord, 2, GL_FLOAT, GL_FALSE, sizeof(SVertex), SVertex::texPosOffset());
}
template<class VertexType>
struct QuadArray
{
std::vector<VertexType> vertices;
VBO::ID vbo;
VAO::ID vao;
int quadCount;
GLsizeiptr vboSize;
ColorQuadArray()
: quadCount(0)
QuadArray()
: quadCount(0),
vboSize(-1)
{
vbo = VBO::gen();
vao = VAO::gen();
@ -53,20 +77,16 @@ struct ColorQuadArray
VBO::bind(vbo);
shState->bindQuadIBO();
glEnableVertexAttribArray(Shader::Color);
glEnableVertexAttribArray(Shader::Position);
glEnableVertexAttribArray(Shader::TexCoord);
glVertexAttribPointer(Shader::Color, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::colorOffset());
glVertexAttribPointer(Shader::Position, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::posOffset());
glVertexAttribPointer(Shader::TexCoord, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::texPosOffset());
/* Call correct implementation here via overloading */
VertexType *dummy = 0;
initBufferBindings(dummy);
VAO::unbind();
IBO::unbind();
VBO::unbind();
}
~ColorQuadArray()
~QuadArray()
{
VBO::del(vbo);
VAO::del(vao);
@ -78,15 +98,36 @@ struct ColorQuadArray
quadCount = size;
}
void clear()
{
vertices.clear();
quadCount = 0;
}
/* This needs to be called after the final 'append()' call
* and previous to the first 'draw()' call. */
void commit()
{
VBO::bind(vbo);
VBO::uploadData(vertices.size() * sizeof(Vertex), &vertices[0], GL_DYNAMIC_DRAW);
VBO::unbind();
shState->ensureQuadIBO(quadCount);
GLsizeiptr size = vertices.size() * sizeof(VertexType);
if (size > vboSize)
{
/* New data exceeds already allocated size.
* Reallocate VBO. */
VBO::uploadData(size, &vertices[0], GL_DYNAMIC_DRAW);
vboSize = size;
shState->ensureQuadIBO(quadCount);
}
else
{
/* New data fits in allocated size */
VBO::uploadSubData(0, size, &vertices[0]);
}
VBO::unbind();
}
void draw(size_t offset, size_t count)
@ -110,4 +151,7 @@ struct ColorQuadArray
}
};
typedef QuadArray<Vertex> ColorQuadArray;
typedef QuadArray<SVertex> SimpleQuadArray;
#endif // QUADARRAY_H