path: root/src/mesa/drivers/dri/r300/r300_render.c

/**************************************************************************

Copyright (C) 2004 Nicolai Haehnle.

All Rights Reserved.

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OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.

**************************************************************************/

/**
 * \file
 *
 * \brief R300 Render (Vertex Buffer Implementation)
 *
 * The immediate implementation has been removed from CVS in favor of the vertex
 * buffer implementation.
 *
 * The render functions are called by the pipeline manager to render a batch of
 * primitives. They return TRUE to pass on to the next stage (i.e. software
 * rasterization) or FALSE to indicate that the pipeline has finished after
 * rendering something.
 *
 * When falling back to software TCL still attempt to use hardware
 * rasterization.
 *
 * I am not sure that the cache related registers are setup correctly, but
 * obviously this does work... Further investigation is needed.
 *
 * \author Nicolai Haehnle <prefect_@gmx.net>
 *
 * \todo Add immediate implementation back? Perhaps this is useful if there are
 * no bugs...
 */

#include "main/glheader.h"
#include "main/state.h"
#include "main/imports.h"
#include "main/enums.h"
#include "main/macros.h"
#include "main/context.h"
#include "main/dd.h"
#include "main/simple_list.h"
#include "main/api_arrayelt.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "vbo/vbo.h"
#include "tnl/tnl.h"
#include "tnl/t_vp_build.h"
#include "radeon_reg.h"
#include "radeon_macros.h"
#include "radeon_ioctl.h"
#include "radeon_state.h"
#include "r300_context.h"
#include "r300_ioctl.h"
#include "r300_state.h"
#include "r300_reg.h"
#include "r300_tex.h"
#include "r300_emit.h"
#include "r300_fragprog.h"
extern int future_hw_tcl_on;

/**
 * \brief Convert a OpenGL primitive type into a R300 primitive type.
 */
int r300PrimitiveType(r300ContextPtr rmesa, int prim)
{
	switch (prim & PRIM_MODE_MASK) {
	case GL_POINTS:
		return R300_VAP_VF_CNTL__PRIM_POINTS;
		break;
	case GL_LINES:
		return R300_VAP_VF_CNTL__PRIM_LINES;
		break;
	case GL_LINE_STRIP:
		return R300_VAP_VF_CNTL__PRIM_LINE_STRIP;
		break;
	case GL_LINE_LOOP:
		return R300_VAP_VF_CNTL__PRIM_LINE_LOOP;
		break;
	case GL_TRIANGLES:
		return R300_VAP_VF_CNTL__PRIM_TRIANGLES;
		break;
	case GL_TRIANGLE_STRIP:
		return R300_VAP_VF_CNTL__PRIM_TRIANGLE_STRIP;
		break;
	case GL_TRIANGLE_FAN:
		return R300_VAP_VF_CNTL__PRIM_TRIANGLE_FAN;
		break;
	case GL_QUADS:
		return R300_VAP_VF_CNTL__PRIM_QUADS;
		break;
	case GL_QUAD_STRIP:
		return R300_VAP_VF_CNTL__PRIM_QUAD_STRIP;
		break;
	case GL_POLYGON:
		return R300_VAP_VF_CNTL__PRIM_POLYGON;
		break;
	default:
		assert(0);
		return -1;
		break;
	}
}

int r300NumVerts(r300ContextPtr rmesa, int num_verts, int prim)
{
	int verts_off = 0;

	switch (prim & PRIM_MODE_MASK) {
	case GL_POINTS:
		verts_off = 0;
		break;
	case GL_LINES:
		verts_off = num_verts % 2;
		break;
	case GL_LINE_STRIP:
		if (num_verts < 2)
			verts_off = num_verts;
		break;
	case GL_LINE_LOOP:
		if (num_verts < 2)
			verts_off = num_verts;
		break;
	case GL_TRIANGLES:
		verts_off = num_verts % 3;
		break;
	case GL_TRIANGLE_STRIP:
		if (num_verts < 3)
			verts_off = num_verts;
		break;
	case GL_TRIANGLE_FAN:
		if (num_verts < 3)
			verts_off = num_verts;
		break;
	case GL_QUADS:
		verts_off = num_verts % 4;
		break;
	case GL_QUAD_STRIP:
		if (num_verts < 4)
			verts_off = num_verts;
		else
			verts_off = num_verts % 2;
		break;
	case GL_POLYGON:
		if (num_verts < 3)
			verts_off = num_verts;
		break;
	default:
		assert(0);
		return -1;
		break;
	}

	return num_verts - verts_off;
}

static void r300EmitElts(GLcontext * ctx, void *elts, unsigned long n_elts)
{
	r300ContextPtr rmesa = R300_CONTEXT(ctx);
	struct r300_dma_region *rvb = &rmesa->state.elt_dma;
	void *out;

	if (r300IsGartMemory(rmesa, elts, n_elts * 4)) {
		rvb->address = rmesa->radeon.radeonScreen->gartTextures.map;
		rvb->start = ((char *)elts) - rvb->address;
		rvb->aos_offset =
		    rmesa->radeon.radeonScreen->gart_texture_offset +
		    rvb->start;
		return;
	} else if (r300IsGartMemory(rmesa, elts, 1)) {
		WARN_ONCE("Pointer not within GART memory!\n");
		_mesa_exit(-1);
	}

	r300AllocDmaRegion(rmesa, rvb, n_elts * 4, 4);
	rvb->aos_offset = GET_START(rvb);

	out = rvb->address + rvb->start;
	memcpy(out, elts, n_elts * 4);
}

static void r300FireEB(r300ContextPtr rmesa, unsigned long addr,
		       int vertex_count, int type)
{
	int cmd_reserved = 0;
	int cmd_written = 0;
	drm_radeon_cmd_header_t *cmd = NULL;

	start_packet3(CP_PACKET3(R300_PACKET3_3D_DRAW_INDX_2, 0), 0);
	e32(R300_VAP_VF_CNTL__PRIM_WALK_INDICES | (vertex_count << 16) | type | R300_VAP_VF_CNTL__INDEX_SIZE_32bit);

	start_packet3(CP_PACKET3(R300_PACKET3_INDX_BUFFER, 2), 2);
	e32(R300_EB_UNK1 | (0 << 16) | R300_EB_UNK2);
	e32(addr);
	e32(vertex_count);
}

static void r300EmitAOS(r300ContextPtr rmesa, GLuint nr, GLuint offset)
{
	int sz = 1 + (nr >> 1) * 3 + (nr & 1) * 2;
	int i;
	int cmd_reserved = 0;
	int cmd_written = 0;
	drm_radeon_cmd_header_t *cmd = NULL;

	if (RADEON_DEBUG & DEBUG_VERTS)
		fprintf(stderr, "%s: nr=%d, ofs=0x%08x\n", __FUNCTION__, nr,
			offset);

	start_packet3(CP_PACKET3(R300_PACKET3_3D_LOAD_VBPNTR, sz - 1), sz - 1);
	e32(nr);

	for (i = 0; i + 1 < nr; i += 2) {
		e32((rmesa->state.aos[i].aos_size << 0) |
		    (rmesa->state.aos[i].aos_stride << 8) |
		    (rmesa->state.aos[i + 1].aos_size << 16) |
		    (rmesa->state.aos[i + 1].aos_stride << 24));

		e32(rmesa->state.aos[i].aos_offset + offset * 4 * rmesa->state.aos[i].aos_stride);
		e32(rmesa->state.aos[i + 1].aos_offset + offset * 4 * rmesa->state.aos[i + 1].aos_stride);
	}

	if (nr & 1) {
		e32((rmesa->state.aos[nr - 1].aos_size << 0) |
		    (rmesa->state.aos[nr - 1].aos_stride << 8));
		e32(rmesa->state.aos[nr - 1].aos_offset + offset * 4 * rmesa->state.aos[nr - 1].aos_stride);
	}
}

static void r300FireAOS(r300ContextPtr rmesa, int vertex_count, int type)
{
	int cmd_reserved = 0;
	int cmd_written = 0;
	drm_radeon_cmd_header_t *cmd = NULL;

	start_packet3(CP_PACKET3(R300_PACKET3_3D_DRAW_VBUF_2, 0), 0);
	e32(R300_VAP_VF_CNTL__PRIM_WALK_VERTEX_LIST | (vertex_count << 16) | type);
}

static void r300RunRenderPrimitive(r300ContextPtr rmesa, GLcontext * ctx,
				   int start, int end, int prim)
{
	int type, num_verts;
	TNLcontext *tnl = TNL_CONTEXT(ctx);
	struct vertex_buffer *vb = &tnl->vb;

	type = r300PrimitiveType(rmesa, prim);
	num_verts = r300NumVerts(rmesa, end - start, prim);

	if (type < 0 || num_verts <= 0)
		return;

	if (vb->Elts) {
		if (num_verts > 65535) {
			/* not implemented yet */
			WARN_ONCE("Too many elts\n");
			return;
		}
		/* Note: The following is incorrect, but it's the best I can do
		 * without a major refactoring of how DMA memory is handled.
		 * The problem: Ensuring that both vertex arrays *and* index
		 * arrays are at the right position, and then ensuring that
		 * the LOAD_VBPNTR, DRAW_INDX and INDX_BUFFER packets are emitted
		 * at once.
		 *
		 * So why is the following incorrect? Well, it seems like
		 * allocating the index array might actually evict the vertex
		 * arrays. *sigh*
		 */
		r300EmitElts(ctx, vb->Elts, num_verts);
		r300EmitAOS(rmesa, rmesa->state.aos_count, start);
		r300FireEB(rmesa, rmesa->state.elt_dma.aos_offset, num_verts, type);
	} else {
		r300EmitAOS(rmesa, rmesa->state.aos_count, start);
		r300FireAOS(rmesa, num_verts, type);
	}
}

static GLboolean r300RunRender(GLcontext * ctx,
			       struct tnl_pipeline_stage *stage)
{
	r300ContextPtr rmesa = R300_CONTEXT(ctx);
	int i;
	TNLcontext *tnl = TNL_CONTEXT(ctx);
	struct vertex_buffer *vb = &tnl->vb;


	if (RADEON_DEBUG & DEBUG_PRIMS)
		fprintf(stderr, "%s\n", __FUNCTION__);

	r300UpdateShaders(rmesa);
	if (r300EmitArrays(ctx))
		return GL_TRUE;

	r300UpdateShaderStates(rmesa);

	r300EmitCacheFlush(rmesa);
	r300EmitState(rmesa);

	for (i = 0; i < vb->PrimitiveCount; i++) {
		GLuint prim = _tnl_translate_prim(&vb->Primitive[i]);
		GLuint start = vb->Primitive[i].start;
		GLuint end = vb->Primitive[i].start + vb->Primitive[i].count;
		r300RunRenderPrimitive(rmesa, ctx, start, end, prim);
	}

	r300EmitCacheFlush(rmesa);

#ifdef USER_BUFFERS
	r300UseArrays(ctx);
#endif

	r300ReleaseArrays(ctx);

	return GL_FALSE;
}

#define FALLBACK_IF(expr)						\
	do {								\
		if (expr) {						\
			if (1 || RADEON_DEBUG & DEBUG_FALLBACKS)	\
				WARN_ONCE("Software fallback:%s\n",	\
					  #expr);			\
			return R300_FALLBACK_RAST;			\
		}							\
	} while(0)

static int r300Fallback(GLcontext * ctx)
{
	r300ContextPtr r300 = R300_CONTEXT(ctx);
	/* Do we need to use new-style shaders?
	 * Also is there a better way to do this? */
	if (r300->radeon.radeonScreen->chip_family >= CHIP_FAMILY_RV515) {
		struct r500_fragment_program *fp = (struct r500_fragment_program *)
	    (char *)ctx->FragmentProgram._Current;
		if (fp) {
			if (!fp->translated) {
				r500TranslateFragmentShader(r300, fp);
				FALLBACK_IF(!fp->translated);
			}
		}
	} else {
		struct r300_fragment_program *fp = (struct r300_fragment_program *)
	    (char *)ctx->FragmentProgram._Current;
		if (fp) {
			if (!fp->translated) {
				r300TranslateFragmentShader(r300, fp);
				FALLBACK_IF(!fp->translated);
			}
		}
	}

	FALLBACK_IF(ctx->RenderMode != GL_RENDER);

	FALLBACK_IF(ctx->Stencil._TestTwoSide
		    && (ctx->Stencil.Ref[0] != ctx->Stencil.Ref[1]
			|| ctx->Stencil.ValueMask[0] !=
			ctx->Stencil.ValueMask[1]
			|| ctx->Stencil.WriteMask[0] !=
			ctx->Stencil.WriteMask[1]));

	if (ctx->Extensions.NV_point_sprite || ctx->Extensions.ARB_point_sprite)
		FALLBACK_IF(ctx->Point.PointSprite);

	if (!r300->disable_lowimpact_fallback) {
		FALLBACK_IF(ctx->Polygon.StippleFlag);
		FALLBACK_IF(ctx->Multisample._Enabled);
		FALLBACK_IF(ctx->Line.StippleFlag);
		FALLBACK_IF(ctx->Line.SmoothFlag);
		FALLBACK_IF(ctx->Point.SmoothFlag);
	}

	return R300_FALLBACK_NONE;
}

static GLboolean r300RunNonTCLRender(GLcontext * ctx,
				     struct tnl_pipeline_stage *stage)
{
	r300ContextPtr rmesa = R300_CONTEXT(ctx);

	if (RADEON_DEBUG & DEBUG_PRIMS)
		fprintf(stderr, "%s\n", __FUNCTION__);

	if (r300Fallback(ctx) >= R300_FALLBACK_RAST)
		return GL_TRUE;

	if (!(rmesa->radeon.radeonScreen->chip_flags & RADEON_CHIPSET_TCL))
 	        return GL_TRUE;

	return r300RunRender(ctx, stage);
}

static GLboolean r300RunTCLRender(GLcontext * ctx,
				  struct tnl_pipeline_stage *stage)
{
	r300ContextPtr rmesa = R300_CONTEXT(ctx);
	struct r300_vertex_program *vp;

	hw_tcl_on = future_hw_tcl_on;

	if (RADEON_DEBUG & DEBUG_PRIMS)
		fprintf(stderr, "%s\n", __FUNCTION__);

	if (hw_tcl_on == GL_FALSE)
		return GL_TRUE;

	if (r300Fallback(ctx) >= R300_FALLBACK_TCL) {
		hw_tcl_on = GL_FALSE;
		return GL_TRUE;
	}

	r300UpdateShaders(rmesa);

	vp = (struct r300_vertex_program *)CURRENT_VERTEX_SHADER(ctx);
	if (vp->native == GL_FALSE) {
		hw_tcl_on = GL_FALSE;
		return GL_TRUE;
	}

	return r300RunRender(ctx, stage);
}

const struct tnl_pipeline_stage _r300_render_stage = {
	"r300 Hardware Rasterization",
	NULL,
	NULL,
	NULL,
	NULL,
	r300RunNonTCLRender
};

const struct tnl_pipeline_stage _r300_tcl_stage = {
	"r300 Hardware Transform, Clipping and Lighting",
	NULL,
	NULL,
	NULL,
	NULL,
	r300RunTCLRender
};