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kwin: Use the new map() interface in makeDecorationArrays()

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Write the vertex data directly into the buffer object, instead of
allocating two temporary arrays, copying the data into them, and
then copying the data from arrays into the buffer object.
This commit is contained in:
Fredrik Höglund 2012-09-18 22:24:01 +02:00
parent de4b7e8db1
commit 7a00648195
1 changed files with 30 additions and 21 deletions
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51
scene_opengl.cpp
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@ -47,6 +47,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <math.h>
#include <unistd.h>
#include <stddef.h>
// turns on checks for opengl errors in various places (for easier finding of them)
// normally only few of them are enabled
@ -1263,39 +1264,47 @@ void SceneOpenGL::Window::paintShadow(const QRegion &region, const WindowPaintDa
void SceneOpenGL::Window::makeDecorationArrays(const WindowQuadList &quads, const QRect &rect, GLTexture *texture) const
{
QVector<float> vertices;
QVector<float> texcoords;
vertices.reserve(quads.count() * 6 * 2);
texcoords.reserve(quads.count() * 6 * 2);
// Since we know that the texture matrix just scales and translates
// we can use this information to optimize the transformation
QMatrix4x4 matrix = texture->matrix(UnnormalizedCoordinates);
matrix.translate(-rect.x(), -rect.y());
float uCoeff = matrix(0, 0);
float vCoeff = matrix(1, 1);
// Since we know that the texture matrix just scales and translates
// we can use this information to optimize the transformation
const QVector2D coeff(matrix(0, 0), matrix(1, 1));
const QVector2D offset(matrix(0, 3), matrix(1, 3));
float uOffset = matrix(0, 3);
float vOffset = matrix(1, 3);
const GLVertexAttrib attribs[] = {
{ VA_Position, 2, GL_FLOAT, offsetof(GLVertex2D, position) },
{ VA_TexCoord, 2, GL_FLOAT, offsetof(GLVertex2D, texcoord) },
};
// Note: The positions in a WindowQuad are stored in clockwise order
const int index[] = { 1, 0, 3, 3, 2, 1 };
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->setAttribLayout(attribs, 2, sizeof(GLVertex2D));
vbo->setVertexCount(quads.count() * 6);
GLVertex2D *vertex = (GLVertex2D *) vbo->map(quads.count() * 6 * sizeof(GLVertex2D));
foreach (const WindowQuad &quad, quads) {
for (int i = 0; i < 6; i++) {
const WindowVertex &v = quad[index[i]];
GLVertex2D v[4]; // Four unique vertices / quad
vertices << v.x();
vertices << v.y();
for (int i = 0; i < 4; i++) {
const WindowVertex &wv = quad[i];
texcoords << v.originalX() * uCoeff + uOffset;
texcoords << v.originalY() * vCoeff + vOffset;
v[i].position = QVector2D(wv.x(), wv.y());
v[i].texcoord = QVector2D(wv.originalX(), wv.originalY()) * coeff + offset;
}
// First triangle
*(vertex++) = v[1]; // Top-right
*(vertex++) = v[0]; // Top-left
*(vertex++) = v[3]; // Bottom-left
// Second triangle
*(vertex++) = v[3]; // Bottom-left
*(vertex++) = v[2]; // Bottom-right
*(vertex++) = v[1]; // Top-right
}
GLVertexBuffer::streamingBuffer()->setData(quads.count() * 6, 2, vertices.constData(), texcoords.constData());
vbo->unmap();
}
void SceneOpenGL::Window::renderQuads(int, const QRegion& region, const WindowQuadList& quads,